If you want to find out from which PPA a specific package was installed or what other PPAs hold it, you can use the following command: (found at superuser.com)
$ apt-cache policy mpd
mpd:
Installed: 0.16.2+git20110331.6d3ed3f-0ubuntu1~ripps1
Candidate: 0.16.2+git20110331.6d3ed3f-0ubuntu1~ripps1
Version table:
*** 0.16.2+git20110331.6d3ed3f-0ubuntu1~ripps1 0
500 http://ppa.launchpad.net/gmpc-trunk/mpd-trunk/ubuntu/ maverick/main amd64 Packages
100 /var/lib/dpkg/status
0.16.1-1ubuntu1 0
500 http://de.archive.ubuntu.com/ubuntu/ natty/universe amd64 Packages
Here you can see that the package mpg
is in the PPA gmpc-trunk/mpd-trunk and also in the natty/universe repository. The installed version is that from the PPA – also indicated by the /var/lib/dpkg/status
line.