I can partition OK,
and copy into it.
I already have ubuntu installed but want my data in its own partition
in case of accidents when reinstalling, updating etc,
as I'v done in windows for decades.
I have found System/Administration/Users and Groups,
and can unlock it.
But I'm scared of fiddling with things I dont understand,
expecially as i havnt backed up for a while.

Still looking for a Tweak utility to do it for me!