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After upgrading to ubuntu 11.10 the speed of my internet connection has considerably reduced. I surf on internet using a wireless usb adapter Digicom Wireless 11n 300m which works with rt2800usb driver.

The fact is, on the installation cd there's no tracks of that driver but instead of it there is another one called rt2870 which I tried to load using ndiswraper, but it did not recognize any hardware. I'm not sure the solution of my problem is simply changing the driver, but I have no other ideas. Can anyone help me?

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I had a very similar problem with a fresh install of 11.04 a while back, which had a similar (inbuilt) ralink wireless chipset on an Asus P5Q3 motherboard.

This link which I found on the Ubuntu forums fixed it for me, speeded up the connection massively, stopped the regular drop-outs and reduced ping times to my router by a factor of over a thousand on average! Maybe it could help you too...

http://www.smachado.com/2010/11/how-to-make-ralink-rt2870-driver-work-on-ubuntu-10-10/

Cheers,

itsjustarumour

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Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. Imagine the linked site goes down for maintenance or forever - your answer would become worthless. –  htorque Oct 21 '11 at 18:40
    
I tried to follow your instructions, but unfortunately I'm not good at dealing with terminal... After a while I've found the file named in that page, I mean 2010_0709_RT2870_Linux_STA_v2.4.0.1.tar.bz2 but I cannot work on it because of my bad competences with commands... :( –  beboka8 Oct 21 '11 at 21:46
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