Archive for the ‘File Convert Tools’ Category

How to install BlueJeans Video calls, sharing, Conference software on Debian / Ubuntu Linux – Convert RPM to DEB package with alien howto

Tuesday, August 28th, 2018


As I'm currently looking for ways to maximize my incomes without taking participation in 5 days week 8 hours schedule in a Big Corporation office job (which prooved for me to be a terrible slavery) I decided to give Free Lancing a try once again. 
Historically I have registrations in some of the most popular Free Lancing services Web platforms such as and
But none of them really was easy enough to handle as applying and winning a project there is usually a lot of headbanging into the walls and the platforms are full of clients that are looking for free lancers for short-term projects the work selection there required too much work, often projects offered there are seriously under-paid and its really hard to negotiate with many of the clients as they're unprofessional in the fields they're working (don't get me wrong I'm not saying many people are not very successful with this platforms, and that the platforms are not providing work for me I only say it is not really something to my liking …

In the mean time if you happen to read this article and looking for a High Quality Empoyee Cheap System Administrator or automation developmer, an IT counseling FreeLancer or a Ultra cheap WebHosting service in the European Union, I'll be very happy if you become my client.

Anyways … further on I decided to further experiment a little bit with other Free Lancing platforms (suggested by a friend Mitko Ivanov who helped me a lot with things and is continuing to help me over the last year ).

So following his kind suggestion I already tried one of the popular FreeLancing which is looking only for a best specialists into the fields of Marketing, Development, System Administration etc. but even though I tried hard with them the guys decided I am not matching there criteria for a the best 1% of all the people in the field of IT so my application for the platform was rejected twice over the last 1 month and a half.

Another similar new platform for free lancing that looks promising that I've learned about is (there site Slogan is Hire FreeLance Talent from the Top 3%) so I went there and registered.

I had hit a road block there too as it seems, there website registration form was not tested enough with non-Windows operating systems with Mozilla Firefox and as it happens that I am using Debian GNU / Linux for my Desktop their drop-down menus was not working, just like some of the form on their website regular expression checks failed.

I've contacted the guys to inform them about their problems (and they kindly advised) I just give a try a registration with different browser (i.e. Google Chrome) which I immediately did and registratoin there was finally a success.
I have to say the new user application form registration of toptal also annoyed me with the stupid requirement to provide a picture in 1000px x 1000px but as this freelancing platform is still new and has way to go until it is established name in the field of freelancing such as and I warmly excuse them.

Once registerered for them the user has to schedule an entry interview just like it goes with a standard company interview with a kind of Human Resources (HR) specialist and I guess some technical guys in order to evaluate on your value (Ha-Ha, someone else to determine your value is already crazy but all crazy employees do it still, of course I don't care as I well know that my value is much more than what they put on me).
The online interview once scheduled has to be done in a Web Meeting (Online Rooms) Platform called BlueJeans similar to Cisco WebEx (that is today heavily used in Corporate world in companies such as Hewlett Packard where we used it heavily, IBM, Concentrix etc.) and others Zoom, JoinMe GotoMeeting, HighFive.

As you could guess BlueJeans (which is by the way a Cloud based meeting software – yackes !) is planned to work mainly on Windows and Mac OS Operating Systems and even though there is a BlueJeans Linux version the provided binary is only for RedHat based linuxes in the RPM binary package format, so in order for me to participate in the scheduled meeting, I either had to port the package and install it on my Debian (what triggeted me to write this article or) use a Virtual Machine such as VirtualBox or VMWare running some kind of Windows OS such as Windows 8 / 10 etc.

Even though I have a Windows 10 OS testbed in a Virtualbox container, I preferred to not use it for BlueJeans and do it the hard way and install BlueJeans on my Debian 9.5 Stretch Linux.

That appeared to be a relatively easy process, so below is how I did it:

1. Download alien convertion (tool) that allows you to convert RPM -> deb, Slackware -> Deb and Linux Standard Base (LDB) packages to deb package format


noah:~# apt-get install –yes alien


2. Download latest BlueJeans version from BlueJeans website

As of time of writting this article the download link for bluejeans online conferencing software is here


noah:~# wget


3. Convert bluejeans rpm package with alien


noah:~# alien –to-deb bluejeans-*.rpm



Warning: Skipping conversion of scripts in package bluejeans: postinst postrm preinst prerm
Warning: Use the –scripts parameter to include the scripts.
bluejeans_1.36.9-2_amd64.deb generated
root@jericho:/home/hipo/Свалени# dpkg -i bluejeans_*.deb
Selecting previously unselected package bluejeans.
(Reading database … 516203 files and directories currently installed.)
Preparing to unpack bluejeans_1.36.9-2_amd64.deb …
Unpacking bluejeans (1.36.9-2) …
Setting up bluejeans (1.36.9-2) …


4. Install the deb package as usual with dpkg tool


noah: ~# dpkg -i bluejeans_*.deb


By default BlueJeans were installed under directory /opt/bluejeans



noah:~# ls -al /opt/bluejeans/bluejeans-bin
-rwxr-xr-x 1 root root 72423392 Jun 14 02:31 /opt/bluejeans/bluejeans-bin*


5. Fix missing library links if such are present in order to make BlueJeans workable

Historically I have dealt with many Linux programs that are provided only in RPM package format and I knew that often once an RPM is converted to DEB with alien due to the package dependency differences on Redhats (CentOS / Fedora etc.) there are problems with missing libraries.

This time this was the case as well, so as usual right after install I did a check up with ldd (print shared object dependencies Linux command) to find out about missing libraries and one library appeared missing.


noah:~# ldd /opt/bluejeans/bluejeans-bin (0x00007fffa2182000) => /lib/x86_64-linux-gnu/ (0x00007fae95f5e000) => /lib/x86_64-linux-gnu/ (0x00007fae95d5a000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae95718000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae95463000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae9523d000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae95030000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae94e0c000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae94aef000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae948aa000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae945f5000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae943b2000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae9415e000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae93e48000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae93b0a000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae938fa000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae935b1000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae93381000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae93154000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae92f4f000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae92d10000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae92adf000) => /lib/x86_64-linux-gnu/ (0x00007fae928ad000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae9269b000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae92495000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae9228b000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae92088000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae91d8a000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae91b87000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae91981000) => /lib/x86_64-linux-gnu/ (0x00007fae91763000) => /lib/x86_64-linux-gnu/ (0x00007fae9155d000) => not found => /lib/x86_64-linux-gnu/ (0x00007fae9130c000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae91104000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae90d85000) => /lib/x86_64-linux-gnu/ (0x00007fae909f2000) => /lib/x86_64-linux-gnu/ (0x00007fae907db000) => /lib/x86_64-linux-gnu/ (0x00007fae90421000)
    /lib64/ (0x00007fae96166000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae9021d000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8fe7f000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8fc6a000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8fa53000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8f850000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8f645000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8f43b000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8f208000) => /lib/x86_64-linux-gnu/ (0x00007fae8efea000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8ed44000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8eb41000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8e919000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8e70b000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8e501000) => /lib/x86_64-linux-gnu/ (0x00007fae8e2fa000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8e0f1000) => /lib/x86_64-linux-gnu/ (0x00007fae8de7f000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8dc7b000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8da79000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8d851000) => /lib/x86_64-linux-gnu/ (0x00007fae8d5c9000) => /lib/x86_64-linux-gnu/ (0x00007fae8d3a1000) => /lib/x86_64-linux-gnu/ (0x00007fae8d18a000) => /lib/x86_64-linux-gnu/ (0x00007fae8cf31000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8cc81000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8ca7d000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8c877000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8c66f000) => /lib/x86_64-linux-gnu/ (0x00007fae8c449000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8c22c000) => /lib/x86_64-linux-gnu/ (0x00007fae8bf10000) => /lib/x86_64-linux-gnu/ (0x00007fae8bcc1000) => /usr/lib/x86_64-linux-gnu/ (0x00007fae8ba94000) => /lib/x86_64-linux-gnu/ (0x00007fae8b87d000) => /lib/x86_64-linux-gnu/ (0x00007fae8b65d000)


As I am on my notebook with Debian 9 and on Debian / Ubuntus and other Linuxes udevd daemon and connected libraries are long time existing, it was obvious the problems to dependencies are because of missing library links (or library version inconsistencies).

To find out what kind of* are present I used slocate package (locate) command.


noah:~# locate


Obviously the missing library was present under a different name so I give a try to just create a new symbolic link from to hoping that the libudev library version Blue Jeans was compiled against did not have a missing binary objects from the ones installed on my OS.


noah:~# ln -sf /lib/x86_64-linux-gnu/ /lib/x86_64-linux-gnu/


noah:~# ldd /opt/bluejeans/bluejeans-bin |grep -i 'not found'


Above command did not return any missing libraries, so I went further and executed it.

6. Go start BlueJeans and register a user or use the anonymous login to be ready for the scheduled online meting

… And, Guess, what it works! 🙂


noah:~# /opt/bluejeans/bluejeans-bin


To make it easy to remember to later start the binary under a familiar name, I've also created a link into


noah:~# ln -sf /opt/bluejeans/bluejeans-bin /usr/bin/bluejeans



noah:~#  sudo su – hipo
hipo@noah:~$ /usr/bin/bluejeans



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How to turn keyboard backlight on GNU / Linux, keyboard no backlight solution

Friday, October 20th, 2017


If you're a GNU / Linux user and you happen to buy a backlighted keyboard, some nice new laptop whose keyboard supports the more and more modern keyboard growing or if you happen to install a GNU / Linux for a Gamer friend no matter the Linux distribution, you might encounter sometimes  problem even in major Linux distributions Debian / Ubuntu / Mint / Fedora with keyboard backlight not working.

Lets say you buy a Devastator II backlighted keyboard or any other modern keyboard you plug it into the Linux machine and there is no nice blinking light coming out of the keyboard, all the joy is gone yes I know. The free software coolness would have been even more grandiose if your keyboard was shiny and glowing in color / colors 🙂

But wait, there is hope for your joy to be made complete.

To make the keyboard backlight switch on Just issue commands:


xmodmap -e 'add mod3 = Screen_Lock'


# Turn on the keyboard bright lamps
xset led on

# Turns off the keyboard bright lamps
xset led off

If you want to make the keyboard backlight be enabled permanent the easiest solution is to

– add the 3 command lines to /etc/rc.local

E.g. to do so open /etc/rc.local and before exit 0 command just add the lines:


vim /etc/rc.local


xmodmap -e 'add mod3 = Screen_Lock'

# Turn on the keyboard bright lamps
xset led on

# Turns off the keyboard bright lamps
xset led off

If you prefer to have the keyboard colorful backlight enable and disabled from X environment on lets say GNOME , here is how to make yourself an icon that enabled and disables the colors.

That's handy because at day time it is a kind of meaningless for the keyboard to glow.

Here is the shell script:

sleep 1
xset led 3
xmodmap -e 'add mod3 = Scroll_Lock'

I saved it as /home/hipo/scripts/

(don't forget to make it executable!, to do so run):


chmod +x /home/hipo/scripts/

Then create  the .desktop file at /etc/xdg/autostart/backlight.desktop so that it runs the new shell script, like so:

[Desktop Entry]
Name=Devastator Backlight

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How to extract a deb package on Debian, Ubuntu, Mint Linux and other non debian based distributions

Friday, October 13th, 2017


How to extract a deb package? 

Have you ever had a debian .deb package which contains image files you need, but the dependencies doesn't allow you to install it on your Debian / Ubuntu / Mint Linux release?
I had just recently downloaded the ultimate-edition-themes latest release v 0.0.7 a large pack of GNOME Themes and wanted to install it on my Debian Stretch Linux but I faced problems because of dependencies when trying to install with dpkg.

That is why I took another appoarch and decided to only extract the necessery themes from the archive only with dpkg.

Here is how I have extracted ultimate-edition-themes-.0.0.7_all.deb ;


dpkg -x ultimate-edition-themes-.0.0.7_all.deb /tmp/ultimate-edition-themes



So how dpkg extracts the .deb file?


Debian .deb packages are a regular more in Wikipedia – Unix archive files (ar) .

The structure of a deb file consists of another 3 files (2 tar.gzs and one binary) as follows:


debian-binary: regular text file, contains the version of the deb package format
control.tar.gz: compressed file, contains file md5sums and control directory for the deb package
data.tar.gz: compressed file, contains all the files which will be installed

Basicly if you're on a Linux distribution that lacks dpkg you can easily extract .deb binary using GNU AR  command (used to create, modify extract Unix ar files and is the GNU / Linux equivallent of the UNIX ar command).

To extract on Fedora or RPM based Linux distributions as well as BSDs with AR:

First print file conetnt with:

ar p  ultimate-edition-themes-.0.0.7_all.deb

Then extract it with:

ar x ultimate-edition-themes-.0.0.7_all.deb


Later just extract with tar (untar), the 2 other archived files contained in the .deb (ar) archive:



tar -zxvvf control.tar.gz; tar -zxxvf data.tar.gz


Get everything you need from there in my case that's the usr/share/themes folder, then enjoy life 🙂


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Converting .crt .cer .der to PEM, converting .PEM to .DER and convert .PFX PKCS#12 (.P12) to .PEM file using OpenSSL

Friday, September 1st, 2017


These commands allow you to convert certificates and keys to different formats to make them compatible with specific types of servers or software. For example, you can convert a normal PEM file that would work with Apache to a PFX (PKCS#12) file and use it with Tomcat or IIS.

  • Convert a DER file (.crt .cer .der) to PEM


    openssl x509 -inform der -in certificate.cer -out certificate.pem
  • Convert a PEM file to DER


    openssl x509 -outform der -in certificate.pem -out certificate.der
  • Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM


    openssl pkcs12 -in keyStore.pfx -out keyStore.pem -nodes

    You can add -nocerts to only output the private key or add -nokeys to only output the certificates.

  • Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)


    openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key \
    -in certificate.crt -certfile CACert.crt

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How to convert .CRT SSL Certificate to .PFX format (with openssl Linux command) and Import newly generated .PFX to Windows IIS Webserver

Tuesday, September 27th, 2016


1. Converting to .CRT to.PFX file format with OpenSSL tool on GNU / Linux to import in Windows (for example, IIS)

Assuming you have generated already a certificate using the openssl Linux command and you have issued the .CRT SSL Certificate issuer file
and you need to have the new .CRT SSL Certificate installed on Windows Server (lets say on Windows 2012) with IIS Webserver version 8.5, you will need a way to convert the .CRT file to .PFX, there is plenty of ways to do that including using online Web Site SSL Certificate converter or use a stand alone program on the Windows server or even use a simple perl / python / ruby script to do the conversion but anyways the best approach will be to convert the new .CRT file to IIS supported binary Certificate format .PFX on the same (Linux certificate issuer host where you have first generated the certificate issuer request .KEY (private key file used with third party certificate issuer such as Godaddy or Hostgator to receive the .CRT / PEM file).

Here is how to generate the .PFX file based on the .CRT file for an Internal SSL Certfiicate:


openssl pkcs12 -export -in server.crt -inkey server.key -out server.pfx

On the password prompt to appear use any password because otherwise the future IIS Webserver certificate import will not work.

To do a certificate chain SSL export to be accessed from the  internet.


openssl pkcs12 -export -in server.crt -inkey server.key -out server.pfx -certfile internet v2.crt

2. Import the PFX file in Windows

Run: mmc, add snap, Certificates, Computer account, Local Computer; in the

Certificates (Local Computer) > Personal > Certificates: Select All Tasks > Import File

Enter previously chosen password.
You should get further the Message "Import was successful."

You can import the PFX file by simply copying it to the server where you want it imported and double click it this will  open Windows Importwizzard.

Then select the IIS:


Site, Properties, Directory Security, Server Certificate, Replace the current certficate, select proper Certificate. Done.

Alternatively to complete the IIS Webserver certificate import within one step when a new certificate is to be imported:

In IIS Manager interface go to :

Site, Properties, Directory Security, Server Certificate, Server Certificate Wizard

Click on



import a certificate from a .pfx file, select and enter password.


3. Import the PFX file into a Java keystore

Another thing you might need if you have the IIS Webserver using a backend Java Virtual Machine on the same or a different Windows server is to import the newly generated .PFX file within the Java VM keystore.

To import with keytool command for Java 1.6 type:


keytool -importkeystore -deststorepass your_pass_here -destkeypass changeit -destkeystore keystore.jks -srckeystore server.pfx -srcstoretype PKCS12 -srcstorepass 1234 -srcalias 1 -destalias xyz

Also the .CRT file could be directly imported into the Java keystore


Import a .crt in a Java keystore

/usr/java/jre/bin/keytool -import -keystore /webdienste/java/jdk/jre/lib/security/cacerts -file certificate.crt -alias Some alias



4. Get a list of Windows locally installed certificates

To manager installed certificates on Windows 7 / 8 / 2012 Server OS is to run command via

Start -> Run





One other way to see the installed certificates on your Windows server is checking within

Internet Explorer

Go to Tools (Alt+X) → Internet Options → Content → Certificates.


To get a a complete list of installed Certificate Chain on Windows you can use PowerShell


Get-ChildItem -Recurse Cert:


That's all folks ! 🙂


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