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My WiFi was working for several months with the network-manager in Ubuntu. A couple of days ago, I tried to connect to an ad-hoc network. Afterwards I have not been able to connect to any wireless networks. I tried both network-manager and command line tools.

Has anyone had this problem before, and has any idea what permanent configuration changes attempting to connect to an ad hoc network might cause?

Note that iwlist scan works fine, and even network-manager can see the wireless networks. I simply cannot connect anymore, and keep getting these messages from dmesg:

[ 3084.305735] wlan0: send auth to 00:18:01:ea:e7:2c (try 1/3)
[ 3084.311016] wlan0: authenticated
[ 3084.311101] iwlwifi 0000:03:00.0 wlan0: disabling HT/VHT due to WEP/TKIP use
[ 3084.314983] wlan0: associate with 00:18:01:ea:e7:2c (try 1/3)
[ 3084.419117] wlan0: associate with 00:18:01:ea:e7:2c (try 2/3)
[ 3084.523236] wlan0: associate with 00:18:01:ea:e7:2c (try 3/3)
[ 3084.631359] wlan0: association with 00:18:01:ea:e7:2c timed out
[ 3084.641166] wlan0: deauthenticating from 00:18:01:ea:e7:2c by local choice (reaso
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