Same problem here on 
  bash# lsb_release -a
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu 12.04.2 LTS
  Release:      12.04
  Codename:     precise
with a 
  bash# lspci | grep -i net
  02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 
24)

found solution using google: linux centrino 6235 wifi problem

try:
  bash# rmod iwlwifi; modprobe iwlwifi 11n_disable=1
verify with 
  bash# systool -m iwlwifi -av | grep 11n

if ok put data into /etc/modprobe.d/51-disable-6235-11n.conf
like:
   bash# cat > /etc/modprobe.d/51-disable-6235-11n.conf
# disable 11n mode in 
#   bash# lspci | grep -i net
#   02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 
24)
# verify with
#   bash# systool -m iwlwifi -av | grep 11n
#   11n_disable         = "1"

options iwlwifif 11n_disable=1
^D

That's it, hope this helps,
Klaus

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https://bugs.launchpad.net/bugs/1112751

Title:
  DHCP over wireless stopped working

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