Comment 17 for bug 1504897

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Martin Pitt (pitti) wrote : Re: packages with only upstart+systemd without sysvinit fail to upgrade: subprocess installed post-installation script returned error exit status 100

This is actually a bug in ubuntu-release-upgrader. The downloaded wily.tar.gz contains *its own* version of invoke-rc.d, and it's wildly out of date (pre-vivid at least). I extracted the tarball and diffed its imported/invoke-rc.d against /usr/sbin/invoke-rc.d and get http://paste.ubuntu.com/12888661/ -- IOW, all the systemd support is completely missing.