Symptoms
After an upgrade fails (for any reason), rerunning the upgrade rarely fails with the following error message in the upgrade log file:
Code Block language bash theme RDark mount: /installs/update/fix/TODO/<Upgrade File Name>.sfs is already mounted
...
This is caused because the failed upgrade was not able to automatically unmount the upgrade file (*.sfs).
Resolution
Unmount the upgrade file manually using the following command:
Code Block language bash theme RDark umount /mnt/update
Rerun the upgrade