Installing Oracle 11g on Ubuntu 8.04

Question

Hello,
I am having a sleepless night trying to install Oracle 11g express on Ubuntu 8.04.
There is no server. I am actually trying to install on the exact box i am using.
I got this error again and again. Any pro and experts please help:
Can't connect to X11 window server using '127.0.0.1:0.0' as the value of the DISPLAY variable.
127.0.0.1:0.0
127.0.0.1:0.0
=======================
oracle@sithkong-desktop:~/database$ DISPLAY=127.0.0.1:0.0
oracle@sithkong-desktop:~/database$ export DISPLAY
oracle@sithkong-desktop:~/database$ xclock
No protocol specified
Error: Can't open display: 127.0.0.1:0.0
oracle@sithkong-desktop:~/database$ ./runInstaller -ignoreSysPrereqs
Starting Oracle Universal Installer...
Checking Temp space: must be greater than 80 MB. Actual 10751 MB Passed
Checking swap space: must be greater than 150 MB. Actual 1915 MB Passed
Checking monitor: must be configured to display at least 256 colors
>>> Could not execute auto check for display colors using command /usr/X11R6/bin/xdpyinfo. Check if the DISPLAY variable is set. Failed <<<<
Ignoring required pre-requisite failures. Continuing...Preparing to launch Oracle Universal Installer from /tmp/OraInstall2009-08-29_10-22-59PM. Please wait ...oracle@sithkong-desktop:~/database$ Oracle Universal Installer, Version 11.1.0.6.0 Production
Copyright (C) 1999, 2007, Oracle. All rights reserved.
No protocol specified
Can't connect to X11 window server using '127.0.0.1:0.0' as the value of the DISPLAY variable.
127.0.0.1:0.0
127.0.0.1:0.0
OUI-10025:Unable to start an interactive install session because of the following error:Can't connect to X11 window server using '127.0.0.1:0.0' as the value of the DISPLAY variable. The DISPLAY environment variable should be set to <hostname or IP address>:<screen>, where the <screen> is usually '0.0'.
OUI-10026:Depending on the Unix Shell, you can use one of the following commands as examples to set the DISPLAY environment variable:
- For csh:                % setenv DISPLAY 192.168.1.128:0.0
- For sh, ksh and bash:      $ DISPLAY=192.168.1.128:0.0; export DISPLAY
Use the following command to see what shell is being used:
     echo $SHELL
Use the following command to view the current DISPLAY environment variable setting:
     echo $DISPLAY
- Make sure that client users are authorized to connect to the X Server.
OUI-10027:To enable client users to access the X Server, open an xterm, dtterm or xconsole as the user that started the session and type the following command:
% xhost +
To test that the DISPLAY environment variable is set correctly, run a X11 based program that comes with the native operating system such as 'xclock':
     % <full path to xclock... see below>
If you are not able to run xclock successfully, please refer to your PC-X Server or OS vendor for further assistance.
Typical path for 'xclock': '/usr/X11R6/bin/xclock'

Answer 1

http://www.pythian.com/news/968/installing-oracle-11g-on-ubuntu-804-lts-hardy-heron
HTH...