'aptitude purge ~c' breaks 14.04.2 LTS upgrade

[Gannet]

During 14.04.1 LTS --> 14.04.2 LTS upgrading I found a strange bug.

How to reproduce:

1) sudo apt-get install linux-generic-lts-utopic xserver-xorg-lts-utopic libegl1-mesa-drivers-lts-utopic xserver-xorg-video-all-lts-utopic xserver-xorg-input-all-lts-utopic

2) sudo aptitude purge linux-headers-3.13.0-48 linux-headers-3.13.0-48-generic linux-image-3.13.0-48-generic linux-image-extra-3.13.0-48-generic

3) sudo aptitude purge ~c

4) reboot

What happens:

system unable to boot graphics session and boots to VM instead.

Founded workaround:

sudo aptitude reinstall xserver-xorg-lts-utopic

So, It seems aptitude purge ~c for some reason breaks xserver package that should be reinstalled then to make system fully botable. Also I found it is reproduced on many computers.

[Axel Beckert (xtaran)]

It's not aptitude's fault if purging _any_ package breaks the system. Reassigning to xserver-xorg-lts-utopic as closest package which may have been the cause.

P.S.: Purging all removed but not purged packages should always be used with care.

[Gannet (ken20001)]

BTW, once I moved back from xserver-xorg-lts-utopic to xserver-xorg and then also executed 'aptitude purge ~c'. It also broke the system and I should reinstall xserver-xorg to fix it.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.