Comment 117 for bug 439138

Bryce suggested back in 23 to take a look at updated packages, heres the list of packages that brought on the epic fail in my system:

mountall 0.2.1 0.2.2
linux-image-2.6.31-13-generic 2.6.31-13.44 2.6.31-13.45
libpython2.6 2.6.4~rc1-0ubuntu1 2.6.4~rc1-0ubuntu2
python2.6 2.6.4~rc1-0ubuntu1 2.6.4~rc1-0ubuntu2
python2.6-minimal 2.6.4~rc1-0ubuntu1 2.6.4~rc1-0ubuntu2
xkb-data 1.6-1ubuntu2 1.6-1ubuntu3
command-not-found-data 0.2.38ubuntu3 0.2.38ubuntu4
command-not-found 0.2.38ubuntu3 0.2.38ubuntu4
update-manager 1:0.126 1:0.126.2
update-manager-core 1:0.126 1:0.126.2
acpi-support 0.127 0.129
gdm 2.28.0-0ubuntu14 2.28.0-0ubuntu15
libgdu-gtk0 2.28.0-1karmic1 2.28.0+git20091012-0ubuntu1
libgdu0 2.28.0-1karmic1 2.28.0+git20091012-0ubuntu1
libgl1-mesa-dri 7.6.0-1ubuntu2 7.6.0-1ubuntu3
libgl1-mesa-glx 7.6.0-1ubuntu2 7.6.0-1ubuntu3
linux-headers-2.6.31-13 2.6.31-13.44 2.6.31-13.45
linux-headers-2.6.31-13-generic 2.6.31-13.44 2.6.31-13.45
mesa-common-dev 7.6.0-1ubuntu2 7.6.0-1ubuntu3
xserver-xorg-input-evdev 1:2.2.5-1ubuntu1 1:2.2.5-1ubuntu2
libglu1-mesa 7.6.0-1ubuntu2 7.6.0-1ubuntu3

so there, the breakage occurred after the upgrade of these packages, hope this helps somehow.

So.... theres no -downgrade option in apt-get, right?