Quando eu estava no Ubuntu 12.04, tudo funcionou perfeitamente. Eu estou agora no Kubuntu 15.04. Quando minha sessão começa, o Wi-Fi é conectado por menos de um minuto e, depois, ele se desconecta sem ter como se reconectar.
Eu sempre tentei desativar a opção 11n, como também matar "wpa_supplicant", mas isso não muda nada.
Esta é a saída do comando lspci :
03:05.0 Network controller [0280]: Ralink corp. RT2561/RT61 rev B 802.11g [1814:0302]
e iwconfig :
wlan0 IEEE 802.11bg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
E alguns registros do sistema depois de tentar se reconectar:
25/09/2015 20:38:07 chris-System-Product-Name NetworkManager[659] <warn> Activation (wlan0/wireless): association took too long, failing activation.
25/09/2015 20:38:07 chris-System-Product-Name NetworkManager[659] <info> (wlan0): device state change: config -> failed (reason 'ssid-not-found') [50 120 53]
25/09/2015 20:38:07 chris-System-Product-Name NetworkManager[659] <info> NetworkManager state is now DISCONNECTED
25/09/2015 20:38:07 chris-System-Product-Name NetworkManager[659] <warn> Activation (wlan0) failed for connection 'FreeWifi'
25/09/2015 20:38:07 chris-System-Product-Name NetworkManager[659] <info> (wlan0): device state change: failed -> disconnected (reason 'none') [120 30 0]
25/09/2015 20:38:07 chris-System-Product-Name NetworkManager[659] <info> (wlan0): deactivating device (reason 'none') [0]
25/09/2015 20:38:07 chris-System-Product-Name NetworkManager[659] <info> (wlan0): supplicant interface state: scanning -> disconnected
25/09/2015 20:38:07 chris-System-Product-Name NetworkManager[659] <warn> Couldn't disconnect supplicant interface: This interface is not connected.
Alguma pista sobre isso?