I don't see why the reboot should be tiggered by aptdaemon. You seem to be confused by the aptdaemon log message which includes the words "shutting down". But this only refers to aptdaemon itself and not the system. That is why renamed the log messages.
I don't see why the reboot should be tiggered by aptdaemon. You seem to be confused by the aptdaemon log message which includes the words "shutting down". But this only refers to aptdaemon itself and not the system. That is why renamed the log messages.