Suppose I update the kernel of a running Debian system using apt-get upgrade linux-image-amd64 to a higher minor version number (e.g., 5.10.10 to 5.10.11). Do I have to reboot the Debian server in order for the update to take effect?
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manifestor
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Yes, usually the kernel update is not done in-place so a reboot is needed to update the running kernel.
You might want to try needrestart via
sudo needrestart -kr l
It will check if the correct kernel is loaded (-k) and will only show an info and not do the restart itself (-r l). See needrestart --help for more info.
boppy
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1Nice, but is checking `/var/run/reboot-required` not much easier? – manifestor Feb 10 '22 at 17:35