On 26 September 2012 17:52, Tom K. C. Chiu <1015...@bugs.launchpad.net> wrote:
> 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:~#
>

Changing source lines, does not downgrade packages. You are still
running dpkg from quantal.

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https://bugs.launchpad.net/bugs/1015567

Title:
  upgrade failed: mixed non-coinstallable and coinstallable package
  instances present

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