How to delete obsolete packages?

[cola]

after aptitude udpate i got:

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Current status: 542 updates [+470], 28356 new [+1469].
There are 18 newly obsolete packages: devicekit-disks, gcj-4.3-base, libcelt0, libdirectfb-1.2-0, libgcj9-0, libgcj9-jar,
                                      libgraphviz4, liblzma1, libmagickcore2, libmagickcore2-extra, libmagickwand2,
                                      libmenu-cache0, libntfs-3g54, libx264-79, libxmmsclient5, libxxf86misc1, w32codecs,
                                      xserver-xorg-video-v4l

How would i delete/remove obsolete packages?
And why are they obsolete?

[craigevil]

They are obsolete because 1) they are not in any repo that is in your sources.list or 2) they are packages you installed locally using dpkg that again are not in the repos in your sources.list.

apt-get autoremove or aptitude purge ~c should remove them.

[debil]

aptitude purge ~c should remove them.

This should be

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aptitude purge ~o

[elric]

Beware, aptitude treats as obsolete also packages installed from repos not enabled at the moment (imagine debian-multimedia), as well as packages locally installed.

aptitude purge ~o will delete ALL those packages.