I upgraded to 2.6.31-15-generic.
Just now I am getting a working wireless connection at university on 5 GHz:
wlan0 IEEE 802.11abgn ESSID:"eduroam-wu"
Mode:Managed Frequency:5.24 GHz Access Point: 00:23:EB:0C:6F:DF
Bit Rate=0 kb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=68/70 Signal level=-42 dBm Noise level=-91 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
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[karmic] Intel WiFi Link 5300 sometimes not working on 5 GHz
https://bugs.launchpad.net/bugs/420678
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