Finding left-over libraries

[peter karlsson <pk@mds.mdh.se>]

Is there any way in Debian to find out what packages no other packages
depend on?

When I install a couple of packages, all the libraries they depend on are
installed as well, which is quite nice, but the reverse doesn't hold - when
I remove packages, unnecessary libraries are not removed. Because of this, I
would like to get a list of packages that no packages depend on (restricted,
for instance, to packages starting with lib).

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peter - http://www.softwolves.pp.se/