Save a list of installed packages on Ubuntu / Debian

In case your laptop crashes during your thesis writing it would be nice to have a list of which packets have been installed.

In Ubuntu / Debian or other some other distros there is a tool called dkpg which offers a small command that can be very helpful:

Saving that list in your backup routine (e.g. of your /home/ dir) every hour using crontab (linux scheduled tasks)

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