*** This bug is a duplicate of bug 836250 ***
    https://bugs.launchpad.net/bugs/836250

The following workaround has solved my issue on my ThinkPad X220 with
Intel Centrino Wireless-N 1000 card using iwlwifi driver (except, of
course, that I don't have N wireless capabilities now):

1) Create a file at /etc/modprobe.d/intel_11n_disable.conf containing this one 
line:
options iwlwifi 11n_disable=1

2) Run this command:
sudo update-initramfs -u

3) Reboot

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https://bugs.launchpad.net/bugs/939218

Title:
  Intel Centrino Wireless N-1000 WiFi slow and disconnects sometimes
  (iwlwifi)

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