Gtk-WARNING **: cannot open display: :0.0
 

Hello

Im trying to access gparted, i get an error
I am connect via vnc if this helps.

thanks.

not vnc related, it's probably becuase you're su'd to root without having run "xhost +localhost" as the owner of the vnc server itself.

thanks for the fast reply, so how can i fix this?
do i log on vnc as user, run "xhost +localhost" in terminal as user then run gparted as a root?

yep, that's the one. There are other reasons for this, but this, especially when asked on a forum is 99% this.

BTW, vnc is awful in every way, I'd *VERY* strongly suggest a decent solution like nx

I actually tried the xhost solution before posting but didn't work , i just wanted to confirm that im doing it correctly.

I tried "export DISPLAY=:0.0" too, doesn't work either

Still error. :scratch:

thank you for your time and suggestion.

The problem is caused by user 'you' owning the display and then user 'root' wanting to get away with it. Yes, 'root' is the supreme God of your system and is omni potent. But not for X11.

The best thing to do is:

- kill the window system
- log off the terminal
- log on as root
- startx
- do your thing

You will HAVE to start X11 as user 'root'. Period.

hey thanks, im a newbie couldn't understand your post fully

but this is what i did lol:
went root and created a new vncserver channel (:2), logged off user (:1), and logged to vncserver :2 as a root and ran gparted lol.

worked! now i can use my new 2tb :)

One other option use:
gksu X_command

I hope five months isn't too long a time to revisit this post after. I'm not using a vnc, whatever that is, but I have had the same problem in my distro (antiX, with heavy modifications), when trying to sudo synaptic and at least one other thing that required root privileges. After some googling, I tried this command:
Then I rebooted, logged back into my account, and found that I can now sudo synaptic. As fruttenboel stated, the problem is that when you're logged in with your user account, the X display is owned by you, so root is not allowed to perform an X command. By using the above command, I copied root's ownership of the X display to my user account. I worried that this would make my user account unable to run any X commands without sudoing (since root now owns X), but apparently not.

If you have antiX use sux (or install it) to open apps as root in X.

Okay, done; but why do I have to this? Why does antiX not let me sudo like I did on MEPIS?

Because sudo is not set up as it is in other distros. su for root access for cli apps annd sux for root access for gui apps works well.
(I think using sudo for gui apps aoemtimes has the issue you have, you should use gksudo)

Hi,

thanks for this hints.

I had a problem to run any GUI application through gksu or kdesudo as well ( Gtk-WARNING **: cannot open display: )
/as from desktop as from terminal/

I solved it by adding:
into
/etc/sudoers

Thanks for this feed. I have just installed Deb testing KDE and found this prob using my usual sudo gparted in a konsole, thanks to trying a few things from this feed I now know that gksu gparted from konsole works fine, and doesn't ask for a password like sudo does, no idea why. Thankyou again davetesc.