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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?

share|improve this question
Can you edit your question to include what version of Ubuntu you are running? – Jop V. May 5 '13 at 8:22
Which Ubuntu release, and architecture did you install? – Mitch May 5 '13 at 8:22
The newest one. 13.0.4 or something like that – Jonas Rothmann Hjalager May 5 '13 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. – Radu Rădeanu May 5 '13 at 8:46
Ye, it's version 13.04 – Jonas Rothmann Hjalager May 5 '13 at 9:09
up vote 3 down vote accepted

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).

share|improve this answer
Restarting my pc to see if it works. – Jonas Rothmann Hjalager May 5 '13 at 9:14
Ubuntu runs faster now, but in the left lower corner it says Unsupported hardware. – Jonas Rothmann Hjalager May 5 '13 at 9:17
@JonasRothmannHjalager Please see here:… – Glutanimate May 5 '13 at 12:57

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