Error: System service failed bis

Hello
I could not log with my password.
I restart my PI with UMBREL.
I could log and I would like to update.
I could connect to my pi with ssh.
But migration message for a long time.
I restarted the pi and I have this message : Error: System service failed
What should I do?
I am not front of my pi. I can connect with it from ssh only and from remote with a vpn to have a local connexion.
Thank you