Upgrade all installed packages to their newest available versions

Package management utility for Debian based distributions.
Recommended replacement for `apt-get` when used interactively in Ubuntu versions 16.04 and later.
More information: <https://manpages.debian.org/latest/apt/apt.8.html>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

sudo apt upgrade

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