It’s not that simple after all: the package
unattended-upgrades, which is available in Debian, Ubuntu, Raspberry Pi OS and practically all other Debian-based Linux distributions, is supposed to bring in daily updates of already installed software packages without user intervention. However, depending on the distribution, adjustments are necessary so that all updates are actually carried out.
With Raspberry Pi OS, for example, the configuration adopted from the Debian project does not work, and without adjustments, no packages are updated at all. On the other hand, not all updates are always desired; Server admins, for example, are only interested in security updates – they want to check feature updates for stability and compatibility first, if they are even considering them.
What is common to all distributions is that
unattended-upgrades all package sources updated daily after installation. Which package updates the program then installs differs from distribution to distribution. With Debian and Ubuntu, for example, packages and security updates from the standard distribution are automatically imported. This is specified in the central configuration file /etc/apt/apt.conf.d/50unattended-upgrades, but in different ways.
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