I cloned the OS disk using a disk cloning device. Booting of Ubuntu off the cloned disk was successful, however, every command returned the error 'command not found.' If I reboot the machine it fixes the issue temporarily.
Can this issue be fixed or should I go about cloning the disk a different way.
The reason I'm cloning the disk is so that I can upgrade the OS from 11 to 14 but go back to the original disk if anything goes wrong with the upgrade.
Edit: I believe it is because the UID for the new disk is different, so the drive gets unmounted and certain commands and programs become inaccessible.