Hardware: Old laptop or computer YunoHost version: 4.2.8.3 I have access to my server : Through SSH | through the webadmin | direct access via keyboard / screen | … Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no If yes, please explain:
For the same reason I deactivated duplicate finder agenda and contact to free some resources of my server and then, the upgrade worked fine.
Thanks for the trick @ljf !