If you try to mix packages of different releases in Ubuntu, you will soon find out that this is not as easy as it seems. The problem is, other than in plain Debian in Ubuntu the backports, security fixes and updates all come with another release tag. I.e., if you want to get package
foo from
jaunty, but everything else from
intrepid - including all the goodies, you get a working pinning setup by creating
/etc/apt/preferences like this:
Package: foo
Pin: release a=jaunty
Pin-Priority: 991
Package: *
Pin: release a=intrepid
Pin-Priority: 990
Package: *
Pin: release a=intrepid-updates
Pin-Priority: 990
Package: *
Pin: release a=intrepid-security
Pin-Priority: 990
Package: *
Pin: release a=intrepid-backports
Pin-Priority: 990
Further reading
