Apt

De Linuxmemo.

Manual update

apt update && apt upgrade -y && apt autoremove

Full auto update

https://help.ubuntu.com/lts/serverguide/automatic-updates.html.en

To enable automatic updates, edit /etc/apt/apt.conf.d/20auto-upgrades and set the appropriate apt configuration options:
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Download-Upgradeable-Packages "1";
APT::Periodic::AutocleanInterval "7";
APT::Periodic::Unattended-Upgrade "1";

Trouble-shooting

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apt-get autoremove && apt-get clean && apt-get autoclean