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Recently I start to get "No protocol specified" when using sudo vim. It's just a warning I guess, because everything was working normally (I can open, edit and save files). The message doesn't appear if I use sudo -E vim so I think I did something wrong when editing /etc/profile recently, but I'm not sure. How can I fix this?

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Not everything is working normally. Mouse support isn't working, it needs a protocol such as gpm or the xterm mouse protocol. –  ninjalj Feb 26 '11 at 17:52

2 Answers 2

up vote 5 down vote accepted

A recent upgrade changed default settings for sudo. If anyone have this problem check your sudoer configuration. From an example in the man page:

# Run X applications through sudo; HOME is used to find the
# .Xauthority file.  Note that other programs use HOME to find
# configuration files and this may lead to privilege escalation!
Defaults env_keep += "DISPLAY HOME"

Make sure you have something like that in /etc/sudoers (use visudo to edit the file if you need to).

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According to this thread, there are two possible solutions to your problem:

Put the following line in my root users .bashrc script

export XAUTHORITY=/home/<user>/.Xauthority

then I copied .Xauthority to root also, i.e.

sudo cp ~/.Xauthority /root

and now the warning is gone.

You could also try running via gksudo.

Anyway, both are worth a try...

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I copied .Xauthority to /root and that's it! –  phunehehe Feb 27 '11 at 4:27
No I was wrong, after rebooting I got "invalid key" error. –  phunehehe Feb 28 '11 at 9:07
As far as I remember the contents of a .Xauthority file changes, so you should symlink it instead of copying. –  Adam Byrtek Mar 31 '11 at 21:43

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