Same problem here. Can't create ad-hoc networks. With Intrepid, both balls get 
green, but then it says 'disconnected'.
Syslog output:
Oct 19 14:23:43 xlaptopx NetworkManager: <WARN>  
nm_device_activate_stage5_ip_config_commit(): Activation (wlan0) Stage 5 of 5 
(IP Configure Commit) start sharing failed. 
Oct 19 14:23:43 xlaptopx NetworkManager: <info>  (wlan0): device state change: 
7 -> 9 
Oct 19 14:23:43 xlaptopx NetworkManager: <info>  Activation (wlan0) failed for 
access point (xlapt) 
Oct 19 14:23:43 xlaptopx NetworkManager: <info>  Marking connection 'xlapt' 
invalid. 
Oct 19 14:23:43 xlaptopx NetworkManager: <info>  Activation (wlan0) failed. 
Oct 19 14:23:43 xlaptopx NetworkManager: <info>  Activation (wlan0) Stage 5 of 
5 (IP Configure Commit) complete. 
Oct 19 14:23:43 xlaptopx NetworkManager: <info>  (wlan0): device state change: 
9 -> 3 
Oct 19 14:23:43 xlaptopx NetworkManager: <info>  (wlan0): deactivating device 
(reason: 0). 
Oct 19 14:23:43 xlaptopx kernel: [ 7031.834797] wlan0: disassociating by local 
choice (reason=3)
Oct 19 14:23:43 xlaptopx NetworkManager: <WARN>  nm_device_wifi_set_ssid(): 
error setting SSID to '(null)' for device wlan0: Invalid argument 
Oct 19 14:23:43 xlaptopx avahi-daemon[5162]: Withdrawing address record for 
10.42.46.1 on wlan0.
Oct 19 14:23:43 xlaptopx avahi-daemon[5162]: Leaving mDNS multicast group on 
interface wlan0.IPv4 with address 10.42.46.1.
Oct 19 14:23:43 xlaptopx avahi-daemon[5162]: Interface wlan0.IPv4 no longer 
relevant for mDNS.
Oct 19 14:23:43 xlaptopx NetworkManager: <WARN>  nm_device_wifi_set_mode(): 
error setting card wlan0 to mode 2: Device or resource busy

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ad-hoc networks don't work with Intel wireless
https://bugs.launchpad.net/bugs/75358
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