Comment 14 for bug 1490110

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Serge Hallyn (serge-hallyn) wrote : Re: [Bug 1490110] Re: package lxc 1.1.3-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 100

So you installed ppa:ubuntu-lxc/stable in vivid, then ran ppa-purge to
revert to archive packaging, then ran do-release-upgrade, which then
failed?