Debian 8 (Jessie): no se puede conectar a WIFI después de la actualización

Recientemente actualicé mi sistema operativo Debian 8. Desde entonces, no he podido conectarme a wifi. LAN funciona simplemente bien. Vea a continuación una muestra de mi resultado de command:

frank@debian8:~$ sudo iwlist wlan0 scan wlan0 Interface doesn't support scanning. frank@debian8:~$ sudo iwconfig lo no wireless extensions. eth0 no wireless extensions. frank@debian8:~$ sudo ifconfig -a eth0 Link encap:Ethernet HWaddr 34:e6:d7:1e:50:21 inet addr:10.68.77.173 Bcast:10.68.77.255 Mask:255.255.255.128 inet6 addr: fe80::36e6:d7ff:fe1e:5021/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:9246 errors:0 dropped:0 overruns:0 frame:0 TX packets:9323 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:7078862 (6.7 MiB) TX bytes:2001113 (1.9 MiB) Interrupt:20 Memory:f7400000-f7420000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:925 errors:0 dropped:0 overruns:0 frame:0 TX packets:925 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:104194 (101.7 KiB) TX bytes:104194 (101.7 KiB) frank@debian8:~$ lspci -vnn | grep -i net 00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection I218-LM [8086:155a] (rev 04) 02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73) frank@debian8:~$ sudo dmesg|grep 'firmw\|wl' [ 4.588961] iwlwifi 0000:02:00.0: firmware: failed to load iwlwifi-7260-17.ucode (-2) [ 4.589058] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-7260-17.ucode failed with error -2 frank@debian8:~$ sudo rfkill unblock all ; sudo ip link set wlan0 up Cannot find device "wlan0" frank@debian8:~$ lspci -knn | grep Net -A2 02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73) Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:4470] 03:00.0 3D controller [0302]: NVIDIA Corporation GF117M [GeForce 610M/710M/820M / GT 620M/625M/630M/720M] [10de:1140] (rev a1) frank@debian8:~$ sudo rfkill list 1: dell-wifi: Wireless LAN Soft blocked: no Hard blocked: no 2: dell-bluetooth: Bluetooth Soft blocked: no Hard blocked: no 3: hci0: Bluetooth Soft blocked: no Hard blocked: no 

Estoy usando un DELL Latitude E5440.

ACTUALIZAR:

Más salida de command:

 frank@debian8:~$ lsmod | grep dell dell_laptop 20480 0 dell_smbios 16384 1 dell_laptop dcdbas 16384 1 dell_smbios dell_smm_hwmon 16384 0 video 40960 3 dell_laptop,nouveau,i915 dell_smo8800 16384 0 dell_rbtn 16384 1 rfkill 24576 5 bluetooth,dell_laptop,dell_rbtn,cfg80211