from the log file provided
Code
The system has been successfully converted.
Processing triggers for man-db (2.8.5-2) ...
run-parts: executing /root/openmediavault-upgrade-4.7/post.d/70-omv-salt
/root/openmediavault-upgrade-4.7/post.d/70-omv-salt: 13: /root/openmediavault-upgrade-4.7/post.d/70-omv-salt: omv-salt: not found
run-parts: /root/openmediavault-upgrade-4.7/post.d/70-omv-salt exited with return code 127
the last script running unsuccessfully is
did you find a more detailed log explaining the reason for the non-zero return code?
this script will need to finish successfully before the next script (sudo run.d/81-apt-dist-upgrade-omv) will work