How can I downgrade a debian package to an older version with apt-get?
Downgrading a package in Debian is not frequently required but sometimes it is a must lets say a package you just upgraded fails to communicate properly to an application, in my case that's Ejabberd server which was working pretty well with Yaxim, Bruno or Xabber Mobile android application clients, unfortunately right after periodic apt-get upgrades I do with apt due to security upgrade of deb package ejabberd=2.1.10-4+deb7u1 to ejabberd=2.1.10-4+deb7u2 it messed up and even though it worked fine with Desktop clients such as Gajim and Pidgin, there was no Android application on my Phone with Android 4.4 which was able to communicate properly with the TLS encrypted Jabber server so my only option was to downgrade back to ejabberd=2.1.10-4+deb7u1.
I looked through duckduckgo.com a short URL is (ddg.gg) but I couldn't find the old deb file to downgrade so I was in a situation …
Then I duckduck goed (I've recently stopped using Google as Google is collecting too much data and sharing with NSA) and I found following instructions on downgrade
If you have the version number, or the target release, apt-get supports choosing a particular version or target release. More details can be found on manual page of apt-get. It can also be accessed from terminal by typing man apt-get
sudo apt-get install <package-name>=<package-version-number> OR
sudo apt-get -t=<target release> install <package-name>
is the command to be run. This can be used to down-grade a package to a specific version.
It has been helpfully pointed out in the comments that
apt-cache showpkg <package-name> – lists all available versions. (h/t Sparhawk)
apt-mark hold <package-name> "holds" – the package at the current version, preventing automatic upgrades. (h/t Luís de Sousa )
In other words All I had to do is as root superuser is:
apt-get install «pkg»=«version»
aptitude install «pkg»=«version»
Where «pkg» is the name of the package, and «version» is the version number.
So I just issued following cmd:
root@pcfreak:~# apt-get install ejabberd=2.1.10-4+deb7u1
Четене на списъците с пакети… Готово
Изграждане на дървото със зависимости
Четене на информацията за състоянието… Готово
Следните НОВИ пакети ще бъдат инсталирани:
0 актуализирани, 1 нови инсталирани, 0 за премахване и 3 без промяна.
Необходимо е да се изтеглят 1795 kB архиви.
След тази операция ще бъде използвано 3699 kB допълнително дисково пространство.
Изт:1 http://ftp.uk.debian.org/debian/ wheezy/main ejabberd amd64 2.1.10-4+deb7u1 [1795 kB]
P.S. Sorry for the cyrillic for those who can't read it but it is standard messages that Debian does in package install time.
Analogously you can do it for any other newer package that upgraded, later on to prevent further security updates of the package you will have to put the package on hold, that's as easy as running:
root@pcfreak:~# aptitude hold ejabberd
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.