Its fixed now :)

I just installed Ubuntu on my PC. I lag a lot. My pc runs all other OS' at high speed, but ubuntu lags like hell. It worked on my old laptop.

My Specs:

  • XFX AMD Radeon HD 7870 Black Edition

  • AMD A8-3800 APU

  • 2x4 GB 1333 MHz Ram

  • 1TB Harddrive

I installed the latest version of Ubuntu. 13.04 I believe.

I run Windows and other linux distros really fast, so why does Ubuntu lag?

  • Can you edit your question to include what version of Ubuntu you are running?
    – jobukkit
    May 5, 2013 at 8:22
  • Which Ubuntu release, and architecture did you install?
    – Mitch
    May 5, 2013 at 8:22
  • The newest one. 13.0.4 or something like that May 5, 2013 at 8:36
  • There is no 13.0.4. Maybe 13.04. Check in a terminal with this command: lsb_release -a to be sure. May 5, 2013 at 8:46
  • Ye, it's version 13.04 May 5, 2013 at 9:09

1 Answer 1


First, make sure you have the drivers needed, so open a terminal, and run this:

sudo apt-get purge fglrx*
sudo apt-get install fglrx
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.bak
sudo aticonfig --initial

Then reboot.

If ubuntu is still slow, you might want to change your desktop environment to something like LXDE, XFCE, KDE, or GNOME (though GNOME under ubuntu can be slower than unity, partly due to the excessive patching made by canonical).


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