gparted won't open, what should i do?

Question

Command line

When I try to run it through the GUI, nothing happens. When I try to run it from the terminal sudo gparted, I get the following:

Invalid MIT-MAGIC-COOKIE-1 key
(gpartedbin:32346): Gtk-WARNING **: cannot open display: :0

Installation was carried out through the terminal:
sudo apt-get install gparted
How do you still run gparted?
In pursuit: If the goal is to modify hard disk partitions by taking a piece from Windows (ntfs) and adding it to Ubuntu (Ext4), then how best to do this: by booting from LiveCD (by the way, is it possible to boot gparted separately to USB media, without the Ubuntu distribution ?), or can it be done directly from a running system?
Thanks in advance to everyone for advice.

Answer 1

Run gparted from the dash (command line in the upper left corner), it will ask for a password and take root rights on its own.