Ubuntu

fehlende repository schlüssel

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys $key

Autoupdate Deaktivieren

/etc/apt/apt.conf.d/10periodic

APT::Periodic::Enable "0"
APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";

/etc/apt/apt.conf.d/20auto-upgrades

APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Unattended-Upgrade "0";