unattended_upgrades_ynh/doc/PRE_UPGRADE.d/1.1~ynh1.md

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Backup is broken and breaks upgrade with it

If the backup fails because some file in /etc/yunohost does not exist, it will prevent any app upgrade.

You should run the upgrade with --no-safety-backup, like that:

sudo yunohost app upgrade unattended_upgrades --no-safety-backup