How do I check if a package comes preinstalled with Ubuntu or if I installed it myself?
20819
Generating list of manually installed packages and querying individual packages
53496
list all suggested packages for currently installed packages
98585
How to check if installing a package will require a reboot?
79410
How do I find out which repository a package comes from?
69275
I installed a program by getting its source code, and then running `sudo make install`; how to make `apt-get` know about it?
158478
Debian checkinstall ignores install=no; how to have it build, but NOT autoinstall a package?
138747
How to list installed packages in apt that are not backed by a repository?
22506
Is there a way to find out whether an updated program/package lands in the official Ubuntu release repositories?
1277
What does it mean that a package is "set to manually installed?"
154248
How to see all packages in a package repository? Website or command line?
38313
Checking if Ubuntu package contains desired update
99406
How to list user installed applications (not packages)?
115802
How to programmatically detect if a LaTeX package is installed?
70138
How can I find out what modifications a program’s installer makes?
35318
How do I list the default installed packages?
131490
How do I save Updates/Installed Packages?
73749
How to find manually installed packages?