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Lately (this past few days after an update) my laptop started acting strange.

The meaning by acting strange is that:

  1. Ubuntu just crashes whenever I fiddle with the wlan.
  2. The internet has become ridiculously slow.

Using speedtest.net points out that when I'm using Ubuntu the download speed graph is very "edgy", the upload seems to be fine. On Windows though the download speed is just fine (around 50mbps, the Ubuntu test didn't get past the 1mbps).

I think it started after the latest kernel update (to 2.3.68.11 if I remember correctly). Tried to update it again but it went even worse than it was before.

Edit:

I've done a speedtest on a live cd with ubuntu 11.04(same as I have installed) And it works great, the installed version is corrupted I guess. how can I fix it?

My system is as follows:

Dual boot: Windows 7 64bit, Ubuntu 11.04 32bit
Laptop: Dell E6410, i7 4 GB Ram
Wireless network card: DW1520 Wireless-N Half-Mini Card
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closed as too localized by fossfreedom Mar 1 '12 at 16:20

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Have you tried to boot into an older live-CD to compare if there's any difference with speedtest? You could e.g. boot into a 10.10 live-CD and try it. –  N.N. Aug 25 '11 at 10:27
    
@N.N. I'll have to download and try. I've never experienced this before, computer has been running smoothly with 11.04 so far. –  Cu7l4ss Aug 25 '11 at 10:55
    
@N.N. I've done the test, seems fine. –  Cu7l4ss Aug 25 '11 at 23:43
    
Do you get bad speeds on a 11.04 live-CD too? –  N.N. Aug 26 '11 at 6:37
    
No. Actually it's great, 15mbps. How can I reinstall the network drivers? –  Cu7l4ss Aug 26 '11 at 8:22

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