Hi Clive,

> I tried your commands and it did not seen to do anything

That command will just asked for a sudo password, if you haven't given
it recently, and then should silently delete the Flatpak cache folders
in that directory.  As is normal with good shell commands, it doesn't
print a ‘everything went well’ message because that would train the user
to ignore the output and miss the error message when it happens.

> so I reverted to GUI; opened /var/tmp as root deleted all the files.

Were the hundreds of Flatpak cache directories still there?

> rebooted and checked contents of /var/tmp = 5.

Good.  A bunch of systemd directories is normal.

> However the warning that filesystem is nearly full remains!

> Checked the 'examine' box to see what that shows; a graphical ring
> chart of root using 13.2GB

I have no idea what that GUI is allocating to ‘root’s usage.  Please
stick with

    df -h /

to show us the root filesystem's usage.

> var has been reduced to 5.7GB; so flatpak entries have gone.

Okay.  You previously said ‘The [var] tmp folder has 11.3GB of data’ so
that's an improvement.

> After aother reboot checked Gparted and that still shows sda1 (root
> partition) still almost full:- sda1 = 26.22GiB, used = 24.13GiB. free
> = 2.09Gib.

Be careful, I don't know whether gparted is including ‘reserved’ space
in its amount of free so you may not be comparing like with like.  Stick
with df.

I don't see how the ‘graphical ring chart’ shows ‘root using 13.2GB’ yet
gparted says ‘used = 24.13GiB’ unless the chart is subtracting use by
other things.  So don't use the chart.  Stick to one method: df.

At one point, you wrote

    /var appears to hold11.3GB  but that changed to 15.9 after looking
    around the file system a bit.

    ...after I extend [sda1] by 2GB by reducing the 'Swop' partitin.
    it's showing only 334Mb free!!!!  I checked the /var and it's gone
    up to 19+3Gb

It doesn't seem obvious why looking around would use so much extra disk
space.

I think you need to investigate, from the command line, using the
commands Keith suggested.  Don't be surprised if the first time you run
du it takes a long time as subsequent runs will find the information it
wants has been cached in RAM from before.  It will show some programs
take a lot of space, e.g. /usr/lib/libreoffice, but you're looking for
something which seems odd.

Always use ‘df /’ before and after you delete something to look for the
improvement, even if you're deleting with a GUI.

One last thought, in /boot, how many files are there starting with
‘vmlin’?

-- 
Cheers, Ralph.

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