TimeSyncd & journald block during upgrade : system don't reboot

Hello !
I’m using official VirtualBox HA image.
i make effort to forget the rule #1 : “it work ? Don’t touch !!!”
I was in 8.1, upgraded successufly in 8.5
Then tried to upgrade in 2022.8.7, and then, systemd cannot stop timesyncd & journald : take more than 1 hour to reboot. tried to hard reboot. reboot in 8.5…
tried again upgrade to 2022.8.7, … same result…
what can i do please ???