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  • Any chance you can explain what OnCalendar=01:00 means and how I can make it update/upgrade ANY time? Does a single asterisk, like OnCalendar=* work? The linked Debian docs are too limited. Commented Jan 18, 2022 at 21:58
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    OnCalendar=1:00 means that unattended-upgrades is run every day at 1:00. With OnCalendar=*-*-* *:00:00 you could run unattended-upgrades every hour, for example. Make sure to set the two APT::Periodic options mentioned in Peter's answer to always, so unattended-upgrades performs an upgrade every time it is run. Commented Mar 19, 2022 at 14:14