For example, if we want to disable CtrlAltDelBurstAction, we could do:
echo 'CtrlAltDelBurstAction=none' >
/etc/systemd/system.conf.d/10-disable-ctraltdel-7times.conf
(or without .conf, same result)
But this has not effect.
Only a modification into /etc/systemd/system.conf is effective.
You probably miss the section (the "[Manager]" line in
/etc/systemd/system.conf). Please try adding it to the drop-in file.
You are 100 % right.
I was digging into the source to understand what was wrong.
Many thanks to point it out.