1/ List all the packages initially installed by the distribution

• gzip -dc /var/log/installer/initial-status.gz | sed -n 's/^Package: //p' | sort -u

2/ List all the packages actually installed by the distribution and manually by the user

• apt list --installed | grep "\[installed\]" | cut -f1 -d/

3/ Compute the differences between the two lists, and display what is relevant

• gzip -dc /var/log/installer/initial-status.gz | sed -n 's/^Package: //p' | sort -u > ~/.bash-apt-0
• apt list --installed | grep "\[installed\]" | cut -f1 -d/ > ~/.bash-apt-1
• diff ~/.bash-apt-0 ~/.bash-apt-1 | grep "> "