I'm trying to install Centos6, but as it turned out, DVD I downloaded was just couple Mb too large (CentOS-6.0-i386-bin-DVD.iso) for DVD to carry. So, to save time and don't download DVD again, I downloaded minimal (CentOS-6.0-x86_64-minimal.iso) and set up successfully.

At first, I did not get that anaconda stuff to show gui for install - only after 4th reinstall, it showed, so I thought install is OK, even thou, I did not get any possibility to customize installable packages. Ok, installed without delays. On first boot up, it did not show X server, just login prompt in a command line. Ok, I logged in, ran a yum update and yum groupinstall "X Window System" "GNOME Desktop Environment", as internets suggested. Tried startx and it just flicker and popped out some errors (EE) SIS(0): Illegal video RAM size (262144K) detected, using BIOS-provided info, so I understood from internets, that SIS chipset is malfunctioning - something is wrong with integrated gpu - I put PCIe one inside. Reboot, startx and nothing - it flickered, popped some messages and then Witing for X server to shutdown, ctrl+alt+F7 shows blinking caret, nothing more. Here is Xorg.0.log.

Can anyone suggest step-by-step tutorial, what needs to be done, to set up GUI on minimal Centos6 system AND make it default on startup, so after boot, X server login screen appears, not the one in commandline.


From my webhost's knowledgebase:

If CentOS has already been installed without a graphical interface, 
you can install this with the following commands:

$ yum groupinstall "X Window System" "Desktop" "Desktop Platform"

$ yum install gdm

If you would like this to be the default runlevel, you can edit 
/etc/inittab and set the default level to 5 instead of 3:

$ vi /etc/inittab


  • This solved 4hrs of head ache. Thank you. – Pred Aug 29 '16 at 17:57
  • The above does not work for me with CentOS 7. X crashes immediately after installation: error setting MTRR (base = 0xe000... – Niklas Rosencrantz Mar 18 '17 at 17:55

You can install this with the following commands:

  1. cd /etc/sysconfig/network-scripts
  2. vi ifcfg-enp0 press "i" insert //NOBOOT=yes press esc > :wq 3.reboot
  3. yum -y group install "GNOME Desktop" "Graphical Administration Tools"
  4. ln -sf /lib/systemd/system/runlevel5.target/etc/systemd/system/defualt.target
  5. reboot again!
  6. yum groupinstall "General Purpose Desktop" -y or yum groupinstall "Desktop" "Desktop Platform" "X Window System" "Fonts" "Graphical Administration Tools" "Internet Browser" -y

  7. yum groupinstall "Office Suite and Productivity" -y

  8. yum groupinstall "Graphics Creation Tools" -y
  9. yum groupinstall kde-desktop -y
  10. startx or init 5

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