How to find what packages do not come from a repository?
55857
How do I get a list of obsolete packages?
5342
How can I check if a package is installed (no superuser privileges)?
46618
How can I know what programs some apt-get package contains?
35000
Can Debian identify rarely used packages?
27076
How to see package version without install?
65
What can I do if a repository/PPA does not have a Release file?
30828
How can I tell which package an executable came from?
151498
How to find out if a specific package is installed on Debian?
7562
How to get ALL kinds of reverse package dependencies: reverse-depends pendant for non-Ubuntu distributions
32921
MiKTeX: [...] does not seem to be a local package repository
69489
How do I figure out what package something is in without resorting to Google?
9896
How do I get and modify the source code of packages installed through apt-get?
41054
How can I check the available version of a package in the repositories?
116
How do I find the package that provides a file?
67802
How to get a list of files for a package I haven't installed yet?
4623
How do I get a list of installed files from a package?
119896
How to find a Python package's dependencies