To add more details to such problem, I tried to revert the source as: sudo sed -i.dist 's,quantal,precise,' /etc/apt/sources.list
and then did the update and dist-upgrade. The same error persist: dpkg: error: parsing file '/var/lib/dpkg/status' near line 75249 package 'libstdc++5:i386': mixed non-coinstallable and coinstallable package instances present E: Sub-process /usr/bin/dpkg returned an error code (2) root@bkgovsrv1:~# -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1015567 Title: upgrade failed: mixed non-coinstallable and coinstallable package instances present To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/1015567/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
