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I'm new to Ubuntu and tried read some similar Q&A without success. I have an old computer - Athlon 3000 XP, motherboard Gigabyte GA 7N 400 pro2, ATI Radeon X1550, 1.8 GB RAM. Istalled Ubuntu 11.10 today and performance is not great. Basically desktop effects are slow, and online videos freeze or are choppy. I've tried sudo apt-get install fglrx command and it improved a bit, but when trying to get to catalyst I'm getting following message: "There was a problem initializing Catalyst Control Center Linux edition. It could be caused by the following. No AMD graphics driver is installed, or the AMD driver is not functioning properly. Please install the AMD driver appropriate for you AMD hardware, or configure using aticonfig" anticonfig say that there's no recognised device. Please help

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What's the output of glxinfo | grep render ? –  severin Nov 20 '11 at 19:08
    
The program 'glxinfo' is currently not installed. You can install it by typing: sudo apt-get install mesa-utils –  Radek Garbowski Nov 20 '11 at 19:23
    
Please install it and then try again, thanks. –  severin Nov 20 '11 at 19:27
    
direct rendering: Yes OpenGL renderer string: Gallium 0.4 on ATI RV515 GL_NV_conditional_render, GL_ARB_draw_elements_base_vertex, –  Radek Garbowski Nov 20 '11 at 19:30
    
sorry that was without fglrx, with that installed it is now: X Error of failed request: BadRequest (invalid request code or no such operation) Major opcode of failed request: 135 (GLX) Minor opcode of failed request: 19 (X_GLXQueryServerString) Serial number of failed request: 12 Current serial number in output stream: 12 –  Radek Garbowski Nov 20 '11 at 19:37
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3 Answers

Your ati card is not supported by fglrx any more.
Please remove fglrx. Now, to be on the safe side, you have to reinstall libgl1-mesa-dri and libgl1-mesa-glx:

sudo apt-get install libgl1-mesa-dri libgl1-mesa-glx

To get better performance with unity, please try unity2d (you can select unity2d by logging out and choosing unity2d in ubuntu's greeter window: enter image description here

Just click on that gear thingy and you can choose unity2d.

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thanks :) i think its time to move back to windows –  Radek Garbowski Nov 20 '11 at 20:53
    
Ah, came on, Linux is great, it really is. Just give it a shot! You could also try the lubuntu-desktop, (sudo apt-get install lubuntu-desktop), a desktop environment designed especially for older hardware. With your specs it should fly. –  severin Nov 20 '11 at 21:03
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Here is a link on how to install the official ATI drivers. And check if your hardware is supported

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