If a process is "holding" on to the space rebooting might be the easiest way to tell.

I have rebooted so is there anything else?

So no change?

Post the output of the command
df -h

clear out /tmp

How can I clear out /tmp?

Filesystem Size Used Avail Use% Mounted on
tmpfs 1.6G 2.2M 1.6G 1% /run
/dev/sda2 1.9T 256G 1.5T 15% /
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 7.8G 0 7.8G 0% /run/qemu
/dev/sda1 96M 32M 65M 33% /boot/efi
tmpfs 1.6G 80K 1.6G 1% /run/user/128
tmpfs 1.6G 116K 1.6G 1% /run/user/1000

No change seemingly maybe or maybe not, maybe.

This is where I got that 274GB or about number and I just realized all but system usage analyzer after analysis is displaying like 274GB now maybe or maybe not, maybe. What safe stuff can I do to clean?

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I would expect the output of the df command to be correct.
Did you create a backup or configure any automatic backups?

Lets see if there are any really big files in your / partition. Try the following command:
The last number of posts except for the #23 and #24 were written clearly, intelligible and without the maybe, maybe not. Again, it makes your posts hard to read. And again may I strongly suggest creating a signature with that line. I think that most members will deal with it and it shows up on your posts at the bottom like mine and rkelsen's above. If not I would expect most members to not respond to your threads anymore. Also remember there are members that are not native English speakers and purposely posting in that manner you could lose out from someone that might know the answer if they could understand the question.

I have a partial backup. Have to make a full one soon. I assume it is a root owned file taking space because Disk Usage Analyzer only has non-sudo access. Should I back up before running that command? All as per one might be maybe or might not be maybe, maybe or maybe not, maybe.

Just found command safe so running before I back up maybe or maybe not, maybe.

Whole output of it with nothing plugged in maybe or maybe not, maybe.

The command is just trying to find large files. It does not write anything to the disk.

I will take away your posting privileges if continue to ignore my request.

Why would I have a big thing in /media and more specifically /media/norvel/UbuntuFilesXE/proc/1/pagemap when I do not have anything plugged in? Can I safely delete it? Am I correct in that number before it is number of bytes? Would you prefer an abbreviation like "X E" for "All as per one... maybe"?

How am I ignoring your requests?