I am using Ubuntu 18.04 and installed 20.04 alongside, in a new partition. However I now realize that this is a mistake. All data is still in 18.04 and 20.04 is empty, it is not an update as I mistakenly assumed. I now understand that I must wait for the dot version of 20.04, to update my former version. My question is: How can I safely delete the new partition with 20.04 again?
SnapOverflow
Start by backing up any important data. Make sure you boot into the 18.04 install and run GParted. Identify the partition with the 20.04 install. If you are running the 18.04 install its partition(s) will be locked. Select the 20.04 install and delete. Don’t be tempted to delete any other partitions that you are unsure of.
If you go ahead with the upgrade to 20.04 it’s a good idea to get 18.04 fully upgraded first.