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I installed Ubuntu 12.04 LTS on my Thinkpad x220.

When I connect to a wireless network, the network speed starts out normal. But after a certain period of time (say, 10 minutes), the network speed progressively slows down. Eventually it disconnects completely, and I cannot even ping the router.

Why could this be happening? I have only had this problem with 12.04.

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Try creating a file /etc/modprobe.d/iwlwifi-11n-disable with the following content and then rebooting.

options iwlwifi 11n_disable=1

Also read the following bug reports to see if you have the same symptoms.

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This is happening on my lenovo u310 with Ubuntu LTS 12.04 as well. Any help would be very appreciated.

The only thing is that, I had tried to uninstall chromium browser completely, so after using synaptic package manager to uninstall packages, I had deleted chrome folders from AppData/local ans AppData/roaming. After that wifi crawls to a stop on any network in a few minutes.

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