ノートパソコンとデスクトップ コンピューターのどちらからでも、WiFi に接続できないことが頻繁にあります。どちらのマシンも Ubuntu 14.04 で動作しています。
時々、Wi-Fi に接続できないことがあります。唯一の解決策はルーターを再起動することのようです。再起動もネットワーク マネージャーの再起動も役に立ちませんでした。 を実行するように提案された解決策も見つかりました。sudo pkill -f wpa_supplicantこれで問題は解決したと思いましたが、残念ながら、同じことが再び起こりました。
問題は、新規起動後またはサスペンドからの復帰後に必ず発生します。ルーターを再起動すると通常は解決し (ただし、その後にマシンの再起動が必要になる場合もあります)、接続は安定したままです。この問題は、Windows、Mac OS、Android を使用する他のデバイスでは発生しません。
以下は、 での接続試行のログです/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.
答え1
以前も同様の問題がありました。wicdネットワークマネージャをインストールすることをお勧めします。インストール手順については、ここ