How to know whether a particular package is installed on ubuntu?
5342
How can I check if a package is installed (no superuser privileges)?
4623
How do I get a list of installed files from a package?
118297
How to find which PPA contains a specific package?
86627
Find where python is installed (if it isn't default dir)
114896
How can I see all versions of a package that are available in the archive?
117360
Check if the application is already installed
55386
Installed Package information, specifically Status
67802
How to get a list of files for a package I haven't installed yet?
77601
How to find out the package download count from a PPA?
94547
Find package name using terminal
49658
Elegant way to check for missing packages and install them?
8780
How can I find out in which distributions a package is available?
115838
List packages on an apt based system by installation date
96810
Given a package name, how can I find out what will change if I install the package?
38313
Checking if Ubuntu package contains desired update
138747
How to list installed packages in apt that are not backed by a repository?
87526
How can I list all applications installed in my system?