Upgrade and restoration fail from "device busy"

[Jaxom99]

Describe the bug

Upgrade and restoration fail, leaving without a Nextcloud :/
Hopefully restoration is willing to work just after a reboot.
See logs and details : https://forum.yunohost.org/t/nextcloud-probleme-a-la-restauration-apres-echec-de-mise-a-jour/31447

Context

• Hardware: VM on Proxmox self hosted
• YunoHost version: 11.2.30.2
• 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
• Using, or trying to install package version/branch: 29.0.7~ynh2
• If upgrading, current package version: 29.0.5~ynh1

Steps to reproduce

see forum post : https://forum.yunohost.org/t/nextcloud-probleme-a-la-restauration-apres-echec-de-mise-a-jour/31447

Logs

upgrade error : https://paste.yunohost.org/raw/tikelozitu
restoration error : https://paste.yunohost.org/raw/rupavarowu