Show apt-get (dpkg) history

/var/log/apt/history.log is the log file for apt-get install/remove: for example I want to find the command that I installed okular package:

cat /var/log/apt/history.log | grep Install | grep okular

This is useful if you want to find all the packages that were included automatically when you install a particular package. So that you can remove them all.

If the package was installed using dpkg command, you can find the log in /var/log/dpkg.log

cat /var/log/dpkg.log | grep adobereader