Update problem V1.25.0 to V1.36.2


I tryed to make the update from my nextcloud admin panel. Every thing seams to work, but now it’s showing “Something went wrong. Try refreshing the page” and nothing happened.

Nextcloud version (eg, 20.0.5): V1.25.0
Operating system and version (eg, Ubuntu 20.04): it’s nextcloud pi
Apache or nginx version (eg, Apache 2.4.25): sorry I don’t know
PHP version (eg, 7.4): sorry I don’t know

I manage to get connecter to SSL with putty but when I try ‘ncp-config’ or type ‘sudo ncp-update’ I get the mesage : “apt is currently running. Try again later”

I don’t knwo at all what I should do. Is there a way to stop the process ? Right now I cannot see my files

Thank you