Upgrade doesn't complete
Summary
In rare conditions, it can happen that the upgrade doesn't complete
In that case, the system is in a state where the unfinished upgrade is preventing a new attempt because of the status window locking the UI.
To clean the upgrade status, remove upgrade data and the status file :
$ sudo rm -rf /data/uploads/upgrade
$ sudo rm -f /data/update.json /etc/nabox/status.json # Some files might not exist
$ sudo systemctl restart naboxd
When you reload the web page, the status window should be gone, letting you re-apply the upgrade.