Thanks for taking the time to report this issue and make Ubuntu better.
To confirm, did you restart your machine after changing /etc/hostname
and /etc/hosts? Generally speaking changing the hostname without a
restart can cause the issues you're describing, because the previous
hostname is cached in the running applications (such as the graphical
display system).
** Package changed: ubuntu => xorg (Ubuntu)
** Changed in: xorg (Ubuntu)
Status: New => Invalid
** Converted to question:
https://answers.launchpad.net/ubuntu/+source/xorg/+question/236080
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https://bugs.launchpad.net/bugs/1168139
Title:
hostname: No protocol specified and Can't open display errors.
Status in “xorg” package in Ubuntu:
Invalid
Bug description:
Hi. During trying to change hostname with 'sudo hostname example_name'
command and after re-enabled console (hostname is changed in a bash
prompt), I can not open any application or edit any files, because of
this error;
,-----[ hostname error ]
| No protocol specified
| Can't open display: %s
`-----
But if I return to a previous hostname, everything works. I've tried:
'gksudo gedit /etc/hostname' command, edit '/etc/hosts' file etc.
Nothing works. Generally, I've tried everything, what I found on the
web and what concerns to the hostname changes.
,----- [lsb_release -a ]
| No LSB modules are available.
| Distributor ID: Ubuntu
| Description: Ubuntu 12.04.2 LTS
| Release: 12.04
| Codename: precise
| -----
| Xubuntu 12.04.2
| hostname 3.06ubuntu1
`-----
Log files such as '/var/log/syslog', or '/var/log/kern.log' and
'.xsession.errors' does not contains any valuable informations.
Best regards.
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