Cannot connect to X server :0.0 [Solved]

[cmost]

Fully up-to-date with Sabayon 5.4 (all the way from 5.0) and now, when I try to run a program as root from the terminal I get the following error:

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cmost@cmost-sabayon64 ~ $ sudo kate
Password:
No protocol specified
No protocol specified
kate: cannot connect to X server :0.0
cmost@cmost-sabayon64 ~ $


The same occurs if I su to root. On the other hand, if I use "kdesu kate" (for example) from the terminal, it opens a KDE authorization dialog and then after entering root's password I can run the specified program with root privileges. Sudo used to work fine. Any ideas here? This is more of an annoyance than a hindrance.

[cmost]

*Bump*

Anyone?

[wolfden]

I'm not seeing a problem here

for KDE use kdesu foo

for gnome use gksu foo

The kdesu and gksu commands are for users in a GUI vs a terminal environment. If you do some googling you will see sudo vs kdesu

[cmost]

Hi Wolfden! I'm familiar with kdesu (KDE) or gtksu (Gnome) for running graphical tools as root versus sudo for doing the same in the terminal. The problem is that until recently, I used to be able to type sudo foo in a terminal and foo would open up as root on my desktop. Now, however, I receive the error I posted. It's true I can type kdesu foo and get the same result but I am wondering what is causing the error so that I might fix it and thus revert to the previous behavior that I prefer. Thanks.

[wolfden]

Probably an environmental path, stuff is constantly changing upstream. I use kdesu and gksu without problems.

[cmost]

I realize I posted this problem awhile ago, and I've been happily using kdesu for awhile but I stumbled upon the solution to this problem today while researching something else and thought I would share the solution just in case anyone was interested. Here's how to get the sudo command to work with GUI applications again.

Open a terminal and issue the command:

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sudo nano /etc/sudoers

Scroll through the file and make sure the following two lines are present (where 'username' is YOUR username):

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root    ALL = (ALL) ALL
username    ALL = (ALL) ALL

# Run X applications through sudo
Defaults env_keep += "DISPLAY HOME"

CTRL+X to save the file

Now issuing

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sudo kate

should launch Kate as root.