Ubuntu/Debian - At the startsudo snap install snap-store - Snapstore sudo -s next passwd change a root passwordpasswd - change a user password sudo apt install stacer - GUI ccleaner for Linux sudo apt install gufw - install firewall sudo apt install clamtk - Antyvirus opensource sudo chkrootkit - Rootkit checkerGNUPG - Keys GPGsudo apt-get update & sudo apt-get install gnupg Install gnupg gpg --gen-key - Create a pair of key gpg --list-key - Check a key gpg -a --export our@email // or ...