Comment 3 for bug 729288

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Dave Walker (davewalker) wrote : Re: package squid 2.7.STABLE7-1ubuntu12.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Hmm, maybe not..

This actually ran,
$ dpkg --compare-versions "2.7.STABLE7-1ubuntu12" lt '2.7.STABLE7-1ubuntu12.1'

Which should have correctly killed squid before the upgrade, reverting back to incomplete.