Solved. The problem is that you should give permission to other users (i.e. the
superuser) to use your open graphical X console. To do that, use the "xhost"
command. Once you log into the X environment, just open a text console and
type:
xhost +
This give permission to any user on any machine to use your graphic terminal.
Then, you can do "su" and run ethereal as root. When you log-out, the access
permission is unset.
Please, note that the previous command give permission to ANY user in ANY host
to send windows to your grahical console. If you prefer to restrict the
access only to users in the local host or to given users, please refer to the
"xhost" command manual.
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