Debian: apt & dpkg

Debian / Ubuntu - apt & dpkg

Task	Command
Refresh repo metadata	`apt update`
Upgrade all packages	`apt upgrade`
Install	`apt install <pkg>`
Remove (keep config)	`apt remove <pkg>`
Remove + config	`apt purge <pkg>`
Search	`apt search <term>`
Install a local .deb	`dpkg -i file.deb`
List installed	`dpkg -l`
Which package owns a file	`dpkg -S /path`
List a package's files	`dpkg -L <pkg>`

Repositories are configured in /etc/apt/sources.list and /etc/apt/sources.list.d/.

$ apt update && apt install -y tree
$ dpkg -S /bin/ls
coreutils: /bin/ls

Exam tip: After dpkg -i fails on a missing dependency, run apt-get install -f to fix broken dependencies.