Con frecuencia tengo problemas para conectarme a mi wifi desde mi computadora portátil y mi computadora de escritorio. Ambas máquinas funcionan con Ubuntu 14.04.
A veces simplemente no puedo conectarme al wifi y la única solución parece ser reiniciar el enrutador. Ni reiniciar ni reiniciar el administrador de red ayudó. También me encontré con una solución que sugería hacer sudo pkill -f wpa_supplicant, la cual ya pensé que habría solucionado el problema, pero no, volvió a pasar.
El problema siempre ocurre después de un arranque nuevo o después de despertar de la suspensión. Una vez que reinicio el enrutador, generalmente se soluciona (aunque a veces también puede ser necesario reiniciar la máquina después) y la conexión permanece estable. Este problema no ocurre en otros dispositivos que usan Windows, Mac OS o Android.
Aquí están los registros de un intento de conexión en /var/log/syslog:
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Auto-activating connection 'Bastians WLAN'.
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) starting connection 'Bastians WLAN'
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> (wlan0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> NetworkManager state is now CONNECTING
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0/wireless): access point 'Bastians WLAN' has security, but secrets are required.
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> (wlan0): device state change: config -> need-auth (reason 'none') [50 60 0]
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> (wlan0): device state change: need-auth -> prepare (reason 'none') [60 40 0]
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0/wireless): connection 'Bastians WLAN' has security, and secrets exist. No new secrets needed.
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Config: added 'ssid' value 'Bastians WLAN'
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Config: added 'scan_ssid' value '1'
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Config: added 'key_mgmt' value 'WPA-PSK'
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Config: added 'auth_alg' value 'OPEN'
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Config: added 'psk' value '<omitted>'
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> Config: set interface ap_scan to 1
Apr 16 21:30:42 Karl2 NetworkManager[811]: <info> (wlan0): supplicant interface state: disconnected -> scanning
Apr 16 21:31:07 Karl2 NetworkManager[811]: <warn> Activation (wlan0/wireless): association took too long, failing activation.
Apr 16 21:31:07 Karl2 NetworkManager[811]: <info> (wlan0): device state change: config -> failed (reason 'SSID not found') [50 120 53]
Apr 16 21:31:07 Karl2 NetworkManager[811]: <info> NetworkManager state is now DISCONNECTED
Apr 16 21:31:07 Karl2 NetworkManager[811]: <info> Marking connection 'Bastians WLAN' invalid.
Apr 16 21:31:07 Karl2 NetworkManager[811]: <warn> Activation (wlan0) failed for connection 'Bastians WLAN'
Apr 16 21:31:07 Karl2 NetworkManager[811]: <info> (wlan0): device state change: failed -> disconnected (reason 'none') [120 30 0]
Apr 16 21:31:07 Karl2 NetworkManager[811]: <info> (wlan0): deactivating device (reason 'none') [0]
Apr 16 21:31:07 Karl2 NetworkManager[811]: <info> (wlan0): supplicant interface state: scanning -> disconnected
Apr 16 21:31:07 Karl2 NetworkManager[811]: <warn> Couldn't disconnect supplicant interface: This interface is not connected.
Respuesta1
Tuve un problema similar antes, recomendaría instalar wicd network manager, se pueden encontrar instrucciones de instalaciónaquí