@ondoho it is a problem with wayland not granting root permission

one workaround is

I've not tested that ( I don't use wayland )
and since wayland is suppose to make things more secure than X11 .. seems daft to undo some of that.

1 members found this post helpful.

^ I see.
Searching this.
I fond this. It says SOLVED.

yes, but the buglink @michaelk posted mentions that ubuntu did not take the upstream fix

Aparece isto:
sudo gparted
[sudo] senha para nogueira:
Unit -.mount does not exist, proceeding anyway.

E não abre a interface gráfica.

Great! Well, not that it solved all your problems, but it saved you from buying a brand new computer and still have the same problem, maybe.

As mentioned way at the beginning, have you tried this yet? If it says Wayland, I'm surprised Linux Mint installs gparted and doesn't have a way for it to run. If it says x11, then things are flubbed up.

If what ever it is you need done, can you finish it up with the live boot? I know this isn't ideal, but it will let you move on until you resolve the issue.

I'm not going to try to refute that, but how bad or insecure has X11 become? I dread the day it's "forced" on us and I have to re-learn fundamental linux! ...after all this time?

I understood the logic with the init.d scripts creating a potential haphazard issue, not that I liked it. Now there are decades of useless, once helpful, information all over. Trying to find answers, to problems always reference to the way things used to work for decades.

echo $XDG_SESSION_TYPE --> X11
Yes, it is too strange.
But I still suspect that the problem still lies in my very obsolete hardware...
Anyway I can still use live-cd when I need it.
Very thanks for the help guys. Thanks a lot!
By the way, how do I close this topic?

so you are not using wayland.

something is very wrong..

looking back at OP I note

apt-file is not installed by default

that tells us it is part of systemd package

cat /usr/share/systemd/tmp.mount
should get you
if not try reinstalling systemd

It looks like sistem.d was not installed on my laptop. So I installed it using:
sudo apt install --reinstall systemd

I just wondered what message appeared on the last line:
"ureadahead will be reprofiled on next reboot" --> What does mean it?

I reboot the system and I give again: sudo apt-file search tmp.mount
And I received: systemd: /usr/share/systemd/tmp.mount
Following I give cat: cat /usr/share/systemd/tmp.mount
And I received the same informations as you post above:
# SPDX-License-Identifier: LGPL-2.1+
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.

[Unit]
Description=Temporary Directory (/tmp)
Documentation=man:hier(7)
Documentation=https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
ConditionPathIsSymbolicLink=!/tmp
DefaultDependencies=no
Conflicts=umount.target
Before=local-fs.target umount.target
After=swap.target

[Mount]
What=tmpfs
Where=/tmp
Type=tmpfs
Options=mode=1777,strictatime,nosuid,nodev

[Install]
WantedBy=local-fs.target

Well, at last it seems the messages matched.

But, unfortunately despite the command appears when I give in console:
ps -xa | grep gparted
617 ? S 0:00 /bin/sh /usr/sbin/gparted
639 ? S 0:00 /bin/sh /usr/sbin/gparted
5203 ? S 0:00 /bin/sh /usr/lib/udisks2/udisks2-inhibit /usr/sbin/gpartedbin
5565 pts/0 S+ 0:00 grep gparted

It is not open in the graphical mode...

As an additional information, As time goes by the app closes itself.
as we can see with:
nogueira@nogueira-Inspiron-1545:~$ ps -xa | grep gparted
2322 pts/0 S+ 0:00 grep gparted

I think you're looking at a reinstall, and be more careful in the future.

A complete system operation reinstall or gparted. If I use: sudo /usr/sbin/gpartedbin in console after a little long time, it starts and works properly. But in the graphical mode it doesn't work.
I would like how to use in the launcher /usr/sbin/gpartedbin %f instead of /usr/sbin/gparted %f. I tryed but it has that I have no root permissions to do that. I would like to add some print-screens from the attempts I made. But I don't have a place to post the print-screens to refer it as a link.
I just don't understand why you "pulled my ear" when you say that I have to be more careful when installing gparted. I just did an install using synaptic...

see bottom
graphical mode?
I get the same with
gparted ( the slow way through menu )
sudo gparted
sudo gpartedbin

They all end up in the same place

where is the "%f" coming from?
where are you using "%f" ?

You can safely ignore @ondoho, they seldom add anything useful

one-liner drivel, sometimes I think it is a bot.

I would suspect it from the "launcher" or menu entry. .desktop specification, it's variable for [file] input from the command line... many menu entries have them, but there's no option to input anything.

You have sure been posting a lot recently, and sometimes it felt like you were needlessly picking on others (me).
So far I have given you the benefit of the doubt, prefering to see an honest effort at contribution.
Not anymore.
Reported.

If you have the time & patience to take everybody by the hand and remotely lead them through problems they don't understand themselves, good for you.
But don't hold it against others if they have a more pragmatic view of things.

yeah., that is what I suspected

I guess , gpartedbin /dev/sdc ( assuming sdc is the usb drive )

Well, I went ahead with a Gnome Wayland desktop ( for another thread )
and I did not have any problems with gparted
This was on Debian Sid.

so the problem is something else ( which we already guessed since it seems OP was actually using X11 )