dpkg

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To force delete a package, run

dpkg --purge --force-depends PKG_NAME

List all Installed packages

dpkg -l

List all files in a package

dpkg -L PKG_NAME

To find which package provides a file

dpkg -S /usr/bin/nmap

To get a list of packages upgraded/installed today

grep "$(date '+%Y-%m-%d')" /var/log/dpkg.log | grep -E "(install|upgrade) "

Apt