sudo apt-get update & sudo apt-get upgrade
The following packages have been kept back:
evolution-common evolution-plugins libgl1-mesa-dri libgl1-mesa-glx
linux-generic
linux-headers-generic linux-image-generic xserver-xorg-core
0 upgraded, 0 newly installed, 0 to remove and 8 not upgraded.
sudo apt-get dist-upgrade
Calculating upgrade... Failed
The following packages have unmet dependencies:
xserver-xorg-core : Recommends: libgl1-mesa-dri (>= 7.10.2-4) but
7.10.2-0ubuntu2 is to be installed
Breaks: libgl1-mesa-dri (< 7.10.2-4) but 7.10.2-0ubuntu2
is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by
held packages.
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https://bugs.launchpad.net/bugs/884152
Title:
Error: Marking the upgrade (from 11.04 to 11.10) - unresolved package
dependencies
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