Hardware: VPS bought online YunoHost version: 4.3.5 I have access to my server : Through SSH Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no
On the upgrade screen, these are the last lines of the log:
Updating dependencies with Composer...
[Error] Upgrade failed.
E: Unable to locate package roundcube-ynh-deps
The app was restored to the way it was before the failed upgrade.