Posts Tagged ‘shows’

Upgrade Debian Linux 9 to 10 Stretch to Buster and Disable graphical service load boot on Debian 10 Linux / Debian Buster is out

Tuesday, July 9th, 2019


I've just took a time to upgrade my Debian 9 Stretch Linux to Debian Buster on my old school Laptop (that turned 11 years old) Lenovo Thinkpad R61 . The upgrade went more or less without severe issues except few things.

The overall procedure followed is described n a few websites out there already and comes up to;


0. Set the proper repository location in /etc/apt/sources.list

Before update the sources.list used are:

deb [arch=amd64,i386] buster main contrib non-free
deb-src [arch=amd64,i386] buster main contrib non-free


deb [arch=amd64,i386] buster/updates main contrib non-free
deb-src [arch=amd64,i386] buster/updates main contrib non-free

deb [arch=amd64,i386] buster-updates main contrib non-free
deb-src [arch=amd64,i386] buster-updates main contrib non-free

deb buster-backports main

For people that had stretch defined in /etc/apt/sources.list you should change them to buster or stable, easiest and quickest way to omit editting with vim / nano etc. is run as root or via sudo:

sed -i 's/stretch/buster/g' /etc/apt/sources.list
sed -i 's/stretch/buster/g' /etc/apt/sources.list.d/*.list

The minimum of config in sources.list after the modification should be

deb buster main
deb buster-updates main
deb buster/updates main

Or if you want to always be with latest stable packages (which is my practice for notebooks):

deb stable main
deb stable-updates main
deb stable/updates main


1. Getting list of hold packages if such exist and unholding them, e.g.


apt-mark showhold

Same could also be done via dpkg

dpkg –get-selections | grep hold

To unhold a package if such is found:

echo "package_name install"|sudo dpkg –set-selections

For those who don't know what hold package is this is usually package you want to keep at certain version all the time even though after running apt-get upgrade to get the latest package versions.

2. Use df -h and assure you have at least 5 – 10 GB free space on root directory / before proceed

df -h /

3. Update packages list to set new set repos as default

apt update


4. apt upgrade

apt upgrade

Here some 10 – 15 times you have to confirm what you want to do with configuration that has changed if you're unsure about the config (and it is not critical service) you're aware as such as Apache / MySQL / SMTP etc. it is best to install the latest maintainer version.

Hopefully here you will not get fatal errors that will interrupt it.

P.S. It is best to run apt-update either in VTTY (Virtual console session) with screen or tmux or via a physical tty (if this is not a remote server) as during the updates your GUI access to the gnome-terminal or konsole / xterm whatever console used might get cut. Thus it is best to do it with command:

screen apt upgrade


5. Run dist-upgrade to finalize the upgrade from Stertch to Buster


Once all is completed of the new installed packages, you will need to finally do, once again it is best to run via screen, if you don't have installed screen install it:


if [ $(which screen) ]; then echo 'Installed'; else apt-get install –yes screen ; fi

screen apt dist-upgrade

Here once again you should set whether old configuration to some e services has to stay or the new Debian maintainer package shipped one will overwrite the old and locally modified (due to some reason), here do wisely whatever you will otherwise some configured services might not boot as expected on next boot.


6. What if you get packages failed on update

If you get a certain package failed to configure after installed due to some reason, if it is a systemd service use:


journalctl -xe |head -n 50

or fully observer output of journalctl -xe and decide on yourself.

In most cases

dpkg-reconfigure failed-package-name

should do the trick or at least give you more hints on how to solve it.


Also if a package seems to be in inconsistent or broken state after upgrade  and simple dpkg-reconfigure doesn't help, a good command
that can help you is


dpkg-reconfigure -f package_name


or you can try to workaround a failed package setup with:

dpkg –configure -a

If dpkg-reconfigure doesn't help either as I experienced in prior of Debian from Debian 6 -> 7 an Debian 7 ->8 updates on some Computers, then a very useful thing to try is:

apt-get update –fix-missing 

apt-get install -f

At certain cases the only work around to be able to complete the package upgrade is to to remove the package with apt remove but due to config errors even that is not possible to work around this as final resort run:

dpkg –remove –force-remove-reinstreq


7. Clean up ununeeded packages


Some packages are left over due to package dependencies from Stretch and not needed in buster anymore to remove them.

apt autoremove


8. Reboot system once all upgrade is over




9. Verify your just upgraded Debian is in a good state


root@noah:~# uname -a;
Linux noah 4.19.0-5-rt-amd64 #1 SMP PREEMPT RT Debian 4.19.37-5 (2019-06-19) x86_64 GNU/Linux


root@noah:~# cat /etc/
Debian GNU/Linux 10


root@noah:~# lsb_release -a
No LSB modules are available.
Distributor ID:    Debian
Description:    Debian GNU/Linux 10 (buster)
Release:    10
Codename:    buster


root@noah:~# hostnamectl
   Static hostname: noah
         Icon name: computer-laptop
           Chassis: laptop
        Machine ID: 4759d9c2f20265938692146351a07929
           Boot ID: 256eb64ffa5e413b8f959f7ef43d919f
  Operating System: Debian GNU/Linux 10 (buster)
            Kernel: Linux 4.19.0-5-rt-amd64
      Architecture: x86-64


10. Remove annoying picture short animation with debian logo looping



By default Debian 10 boots up with annoying screen hiding all the status of loaded services state .e.g. you cannot see the services that shows in [ FAILED ] state and  which do show as [ OK ] to revert back the old behavior I'm used to for historical reasons and as it shows a lot of good Boot time debugging info, in previous Debian distributions this was possible  by setting the right configuration options in /etc/default/grub

which so far in my config was like so

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash scsi_mod.use_blk_mq=y dm_mod.use_blk_mq=y zswap.enabled=1 text"

Note that zswap.enabled=1 passed option is because my notebook is pretty old machine from 2008 with 4GB of memory and zswap does accelerate performance when working with swap – especially helpful on Older PCs for more you can read more about zswap on ArchLinux wiki
After modifying this configuration to load the new config into grub the cmd is:


As this was not working and tried number of reboots finally I found that annoying animated gif like picture shown up is caused by plymouth below is excerpts from Plymouth's manual page:

       "The plymouth sends commands to a running plymouthd. This is used during the boot process to control the display of the graphical boot splash."

Plymouth has a set of themes one can set:


# plymouth-set-default-theme -l


I tried to change that theme to make the boot process as text boot as I'm used to historically with cmd:

update-alternatives –config text.plymouth

As after reboot I hoped the PC will start booting in text but this does not happened so the final fix to turn back to textmode service boot was to completely remove plymouth

apt-get remove –yes plymouth

Why and how to fix when Debian Linux detects and shows only 3GB of memory even though 4 or more are present

Saturday, September 8th, 2012

I was quite shocked to find out free -m was showing 3GB of memory on a brand new purchased Lenovo ThinkCentre Edge71 (according to guarantee paper with 4GB). I got angry seeing this, I paid 350 EUR for a Desktop host and suddenly, there is one giga less …

Since I was not sure if by mistake someome shipped the system with 1 Gigabyte or there is something wrong with Linux unable to detect the whole amount of memory I entered BIOS (on Lenovo ThinkCentre Edge series – to enter BIOS press F1.

Interestingly in BIOS, I can see 4 GigaBytes of memory are present, well this was puzzling … :

Lenovo ThinkCentre Edge71 esktop PC BIOS picture

Still free -m show me 3GB:

# free -m
total used free shared buffers cached
Mem: 2989 186 2803 0 4 76

-/+ buffers/cache: 105 2884
Swap: 5651 0 5651

I checked also in top and htop, hoping maybe there 4 Gigas will show up but nope there also the whole amount of system memory was identified as 2989 MB.

I thought for a while and my first thought was probably, the memory is not detected because there might be integrated Videocard configured to use 1 GB of RAM. So next logical thing to do was check in BIOS, what kind of settings are set for the Video adapter.

possible settings for Video Setup menu are:


PEG stands for (PCI-e Graphics Device
– IDG is abbreviaton from (Internal Graphics Device)
I give a try to all of them, but I didn’t see any change in amount of detected memory. Debian Squeeze Linux 6.0.5 was always detecting 2989 max memory. I also tried also changing the amount of IGD Pre-allocated Memory Size from 128M to 32MB as well as decreasing the amount of Total Graphics Memory to 128MB. Unfortunately doing all kind of changes didn’t influenced the amount of detected memory by Linux kernel …

To make sure the 3GB detected memory is not because of some Debian Squeeze GNU / Linux bug I tried using a PuppyLinux 4.2.1 LiveCD just to see PuppyLinux was also detecting with 1 GIGA less…

Onwards after a quick research online I red people are experiencing similar problems on Linux, whether a 32 Bit kernel is used on 64 bit machines.
Weirdly it seems 32 Bit Linux kernels (even the new ones) are having troubles detecting more than 3GB of memory, but there is a need for some kind of bigmem supporting kernel .
Here is the exact Linux kernel version making the troubles:

# uname -a;Linux pcfreak 2.6.32-5-686 #1 SMP Sun May 6 04:01:19 UTC 2012 i686 GNU/Linux

Until checking the kernel release, I didn’t realized in the hurry installed a 32 bit version of Debian on the 64 bit machine so to fix up the situation installed 64 bit version kernel;

# apt-get install --yes linux-image-2.6.32-5-amd64

And Hooray! After restarting and booting with the new 64 bit (amd64) kernel, the missing 1 Gigabyte of memory started being detected:

# uname -a;
Linux pcfreak 2.6.32-5-amd64 #1 SMP Sun May 6 05:12:07 UTC 2012 x86_64 GNU/Linux
# free -m
total used free shared buffers cached
Mem: 3913 261 3651 0 4 71
-/+ buffers/cache: 186 3727
Swap: 5651 0 5651

Seeing system boot up fine with the amd64 bit kernel, I removed the old 32 bit kernel, e.g.:

# apt-get --yes remove linux-image-2.6.32-5-686

Well that’s all folks 🙂