List installed apt packages

[j143]

apt list --installed

In case you want to list all the python2 related packages installed. use grep

$ apt list --installed | grep python2

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

libpython2.7/now 2.7.17-1~18.04ubuntu1.1 amd64 [installed,upgradable to: 2.7.17-1~18.04ubuntu1.6]
libpython2.7-dev/now 2.7.17-1~18.04ubuntu1.1 amd64 [installed,upgradable to: 2.7.17-1~18.04ubuntu1.6]
libpython2.7-minimal/now 2.7.17-1~18.04ubuntu1.1 amd64 [installed,upgradable to: 2.7.17-1~18.04ubuntu1.6]
libpython2.7-stdlib/now 2.7.17-1~18.04ubuntu1.1 amd64 [installed,upgradable to: 2.7.17-1~18.04ubuntu1.6]
python2.7/now 2.7.17-1~18.04ubuntu1.1 amd64 [installed,upgradable to: 2.7.17-1~18.04ubuntu1.6]
python2.7-dev/now 2.7.17-1~18.04ubuntu1.1 amd64 [installed,upgradable to: 2.7.17-1~18.04ubuntu1.6]
python2.7-minimal/now 2.7.17-1~18.04ubuntu1.1 amd64 [installed,upgradable to: 2.7.17-1~18.04ubuntu1.6]