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I have upgraded to Ubuntu 13.04 a few days ago.

Last night I went to a friend's house where we were 5 persons total. Everyone noticed that the internet was slow - except me. For me it was fast.

So we decided to to a little experiment.We started turning off the laptops to see which was causing the trouble. When I turned off mine, the connection speed was restored for the others! (no one of us was downloading/uploading/cloud synchronizing anything). Their laptops had Windows, but one of them had Ubuntu 12.10 on a partition. So he booted into it, and still his connection was slow. When I disconnected from the LAN, it was ok.

Today another friend came at my house (running windows) and we are having the same trouble. When I d/c from the LAN it's ok, when I am online his internet is slow. So that means that it wasn't a problem with my friend's router (last night).

I am concluding the my pc is causing the trouble. I even downloaded avg for linux to search for viruses - it didn't find anything.

Any ideas what might be the cause? A newly introduced bug?

Note: I checked the monitor program and I wasn't downloading/uploading anything (~1Kbps download, ~0 upload)

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up vote 3 down vote accepted

I was having the same problem and it was driving me nuts, so I installed a fresh copy of 12.04LTS and the same thing was happening. which was weird 'cause that's never happened to me before. I then disabled the proprietary driver for the wireless card, rebooted and no more slowing down my network. Try that, hopefully it will be your solution as well.

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The solution worked! I removed the proprietory drivers for the WiFi and and everything is as before. Maybe there's a bug in their code. –  user92834 May 19 '13 at 14:08
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