Unable to run a GUI app as root using su?
 

I am using KDE and I always log in as a user. However, there are times when I must run my editor Quanta as root (so that I can directly save files in the /var/www folder rather than go through the trouble of saving them in /home/hari and then copying them to /var/www

For this I always used to run su from a terminal window and then run the application.

After quite a while now, I again tried to run Quanta as root.

I get this error:
What could be the reason for this sudden problem? I changed no config files as far as I know and I am in KDE.

This may have something to do with upgrading su and the config file. If anybody knows how to fix this, I would be grateful for an answer.

hi there,

something called "xhost +" ...
you need to be allowed to export the display...
before su do the following
and after su...
regards
slackie1000

Thanks slackie1000. This works.

Are these options volatile? Will it work after a reboot or must I execute them again?

hi there,
nope.. you need to execute again..
but i think, somewhere , somehow, you can make it standard. .. but this is out of my knowledge. sorry.
regards
slackie1000

The big mystery is that it worked earlier without this. It is only recently that it has given me that error.

So it must be a config file issue. Anybody?

You can always press Alt-F2 to bring up the "run application" pop-up prompt. Fill-in quanta and check the option to run as a different user (root). You can also check the option to remember the root password.

This is a good workaround. Thanks. It works.

In the meantime if anybody can suggest a solution to the first problem (regarding su), I'd be very grateful.

I used kdesu anyway and created a shortcut on the desktop.

Thanks for all suggestions :)