I think I may have the same problem as this, symptoms are similar. I performed and aptitude full-upgrade earlier this week. This installed a new kernel 4.4.0-71 amongst other package updates. After a reboot NetworkManager applet was stating 'Device not ready' for the wifi device. I went back to an earlier kernel, but the symptoms are the same.
My wifi device is Intel Centrino Advanced-N 6205 [Taylor Peak] To work around the problem I disable wifi, restart NetworkManager and enable wifi. The wifi then connects. The following three commands get the system working fine. nmcli radio wifi off systemctl restart NetworkManager sleep 5 nmcli radio wifi on -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1659750 Title: Wifi does not work Status in linux package in Ubuntu: Triaged Bug description: Network manager tells "device not ready". Restarting network manager does not help. Wifi failed to work occasionally before, but now it does not work at all. Hardware may be broken. At least it is as for wired network, I suppose. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-57-generic 4.4.0-57.78 ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35 Uname: Linux 4.4.0-57-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jarnos 1623 F.... pulseaudio CurrentDesktop: XFCE Date: Fri Jan 27 10:03:55 2017 EcryptfsInUse: Yes InstallationDate: Installed on 2016-04-28 (273 days ago) InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) MachineType: LENOVO 89224MG PccardctlIdent: Socket 0: no product info available PccardctlStatus: Socket 0: no card ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-57-generic root=UUID=15cc1d62-fbc6-4ce3-bf32-e35c61a921cf ro RelatedPackageVersions: linux-restricted-modules-4.4.0-57-generic N/A linux-backports-modules-4.4.0-57-generic N/A linux-firmware 1.157.6 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/13/06 dmi.bios.vendor: LENOVO dmi.bios.version: 63ET13WW dmi.board.name: CAPELL VALLEY(NAPA) CRB dmi.board.vendor: LENOVO dmi.board.version: Not Applicable dmi.chassis.type: 10 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.modalias: dmi:bvnLENOVO:bvr63ET13WW:bd09/13/06:svnLENOVO:pn89224MG:pvr3000C200:rvnLENOVO:rnCAPELLVALLEY(NAPA)CRB:rvrNotApplicable:cvnNoEnclosure:ct10:cvrN/A: dmi.product.name: 89224MG dmi.product.version: 3000 C200 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1659750/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
