I am returning to Ubuntu after some time so I am a bit rusty. My machine is running 16.04 LTS and I want to upgrade to the current 18.04. I have downloaded this and want to transfer it to a CD-R so that I can boot from that but I get an error message saying that the drive is already mounted. They problem is that I cannot remember how to un-mount it or find the instructions in the built-in help.
I could, I suppose, upgrade directly from the downloaded copy on the HD but I cannot remember how to do that either.
Thank you.
12 Answers
If you'd rather do it the graphical way, just launch Disks from the launcher. Click on your CD drive, and you'll see a square under where the partitions are. Click it, and you're done!
For the first drive use:
udisksctl unmount -b /dev/sr0For the second drive:
udisksctl unmount -b /dev/sr1
