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Enterprise Linux: Common GUI / X-Window Issues (Doc ID 418963.1)

Last updated on JANUARY 31, 2022

Applies to:

Linux OS - Version Enterprise Linux 4.0 and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64
Linux x86
Display Manager


This note provides an overview of the Linux X-Windows System and discusses how to resolve basic X-Windows related issues on Enterprise Linux.


The note is primarily intended for Enterprise Linux System Administrators seeking to understand and resolve X-Windows related issues on Enterprise Linux.


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In this Document
 The X Window System - What is it?
 The Main Players
 Configuration and Log File Locations
 Configuration Issues - Basic Things You Can Try
 Common Problems and Solutions
 1. I did not install the X-Window System during initial Linux install - how can I install it now?
 2. How to get a graphical login all the time until the next reboot?
 3. When logging into the GNOME environment, I get a warning saying that I'm already logged in.
 4. When attempting to shut own the system from the Gnome logout menu, a window with a red 'X' appears. Likewise, when I try to shut off the machine using 'halt', 'poweroff' or 'shutdown' I get other errors.
 5. How do I mount/unmount CD-ROM/DVD/floppy disks?
 6. The X-Server seems to have crashed - there is no Enterprise Linux login screen, just a command prompt.
 7. The keyboard shortcuts seem to have changed - what are the new shortcuts?
 8. How to run a graphical clock on the desktop?
 9. I ran startx, but all I get is a black screen - What should I do?
 10. When I run startx, I get errno 111 - What does this mean?

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