Update/Upgrade

[TErxleben]

Is it possible to have updates installed automatically and only be informed by email if a restart is necessary? If yes, how?

 

[UdoB]

Yes, everything is possible. One road (not a solution without additional configuration) is this:

# apt show  unattended-upgrades
# vi /etc/apt/apt.conf.d/50unattended-upgrades

I let my systems install security updates automatically and do the rest manually. Ymmv...

 

[TErxleben]

Thanks for your hint. As I suspected, it is not possible without leaving the “Proxmox universe”.
Then, as you recommended, I'll run a cron job in parallel.