I upgraded from ubuntu 14.04 LTS to ubuntu 16.04 LTS. My wifi was working fine in previous version. But, after upgrade wifi broke. It won't show any wifi networks and I couldn't enable wifi from ubuntu panel on top right corner.
I tried almost all suggestions in this page and few other askubuntu pages with same problem:
http://askubuntu.com/questions/62166/siocsifflags-operation-not-possible-due-to-rf-kill
But, nothing worked.
Here is my console output:
~$ sudo rfkill list
0: dell-rbtn: Wireless LAN
Soft blocked: yes
Hard blocked: yes
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
7: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
Then, I ran "sudo rfkill unblock wifi" but that didn't fix anything.
Finally, the only thing that worked was:
sudo modprobe -r dell-rbtn
I don't even know if this is the right way to fix it. Please fix the 16.04 kernel and OS upgrade package so that other users don't face this problem that cost me 2 days. Thank you.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.14
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sat Sep 17 15:13:39 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-08-19 (29 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
ProcEnviron:
LANGUAGE=en_US
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: parag 3685 F.... pulseaudio
/dev/snd/controlC1: parag 3685 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=bad8d93e-83c4-40c0-aa97-00ac6c4e373e
InstallationDate: Installed on 2016-08-19 (38 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: Dell Inc. Inspiron 3542
NonfreeKernelModules: wl
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-36-generic.efi.signed root=UUID=206733db-103a-4078-847b-0a897121325e ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
RelatedPackageVersions:
linux-restricted-modules-4.4.0-36-generic N/A
linux-backports-modules-4.4.0-36-generic N/A
linux-firmware 1.157.2
Tags: xenial
Uname: Linux 4.4.0-36-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 08/05/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 02RD2H
dmi.board.vendor: Dell Inc.
dmi.board.version: A04
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd08/05/2014:svnDellInc.:pnInspiron3542:pvrNotSpecified:rvnDellInc.:rn02RD2H:rvrA04:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Inspiron 3542
dmi.product.version: Not Specified
dmi.sys.vendor: Dell Inc.
After upgrade, my hardware switch for wifi (accessed by Fn + function key) stopped working. But, all other function keys to control display brightness, volume, mute have been working fine.
There are some pages on askubuntu.com which discuss the same problem that I have. But, they talk about re-installing broadcom drivers, etc. I checked mine and I seem to have a qualcomm device instead of broadcom. See below:
~$ lspci -vnn | grep Network
06:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01)
Subsystem: Dell QCA9565 / AR9565 Wireless Network Adapter [1028:020c]