Add a pre_upgrade message

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Salamandar 2024-03-11 11:55:23 +01:00
parent 6a38db1bbe
commit d887b9b978

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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:
```bash
sudo yunohost app upgrade unattended_upgrades --no-safety-backup
```