It can't be an Ubuntu bug because you can force the install of Ubuntu's version of ppa-purge, and if you take care of changing DISTRIB_CODENAME=maya to DISTRIB_CODENAME=precise in /etc/lsb-release, you can use Ubuntu's ppa-purge without a problem.
Just do an
apt-cache policy ppa-purge and you'll see this:
- Code: Select all
0.2.8+bzr56-1linuxmint12 0
700 http://packages.linuxmint.com/ maya/upstream amd64 Packages
0.2.8+bzr56 0
500 http://archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages
Because the default apt pinning, the candidate for all regular users is always Mint's version, not Ubuntu's.
The most probable reason that Maya's own ppa-purge script is still pointing to "oneiric" is that some dev forgot to make the change when the package was ported from Lisa to Maya (look at the
1linuxmint12 part of the package name).