I found a way to get it to work:
$ sudo modprobe -r iwlagn
$ sudo modprobe iwlagn 11n_disable=0
Then iwconfig displays:
wlan0 IEEE 802.11abgn ESSID:"chris"
Mode:Managed Frequency:2.412 GHz Access Point: 68:7F:74:9B:3F:50
Bit Rate=270 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=64/70 Signal level=-46 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
It seems 11n is disabled as a default !?
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Intel Centrino Ultimate-N 6300 supports abg only
https://bugs.launchpad.net/bugs/654152
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