168c:0042 Wifi not working in Ubuntu 14.04 LTS

[Rricha Jalota]

I have installed Ubuntu 14.04 along with Windows 8.1. My Wifi is working in windows but not in Ubuntu. I gave the following command in the command terminal.

 nmcli nm
RUNNING STATE WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
running connected enabled enabled enabled enabled
lspci -knn | grep Net -A2
03:00.0 Network controller [0280]: Qualcomm Atheros Device [168c:0042] (rev 30)
    Subsystem: Lite-On Communications Inc Device [11ad:0806]

ubuntu-bug linux

(process:3454): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed

Though it says wifi is enabled, yet it's not working. I have an Acer Aspire E5-573 laptop.
What should I do to make it work?

What is the full computer model number (ex. HP G32-301TX Notebook PC)? Acer Aspire E5-573
If you update your BIOS to the newest version following the guide here, does this change anything?
A: I couldn't understand this.
Regarding your wireless Access Point (AP):

    3a. What is the current AP manufacturer, full model, revision, and firmware version? dont know
    3b. If you update the AP to the latest firmware does it change anything? dont know
    3c. What wireless connection type are you using (802.11ac, 802.11n 150/300, 802.11g, etc.)? dont know
    3d. If you switch to a different wireless type (802.11g or 802.11n if you are using 802.11g) does this change anything?
A: how should i do that?
    3e. What channel specifically are you using when this problem is reproducible?
A: I'm using the default channel.
    3f. In order to understand the wireless environment your AP is working in, please provide the output of the following terminal command:

    sudo iw dev wlan0 scan | grep -i "ds parameter set"
output : command failed: No such device (-19)

    3g. What encryption type are you using (ex. WEP, WPA2-PSK, etc.)?
A: WPA2-PSK
    3h. If you change and remove encryption entirely does this change anything?
a: How should I do that? Where's the option?
    3i. Do you have QoS (Quality of Service)/WMM (Wi-Fi Multimedia) enabled?
A: I can't see any option like that in the network panel.
    3j. If you disable/enable QoS/WMM does it change anything?
    3k. What is the current beacon interval (usually default is 100)?
A: if beacon interval means band, it has been set to B/G (2.4 Ghz)
    3l. If you adjust this to 50 does it change anything?
A: no
    3m. Does your AP have a firewall enabled?
A: It's set to default.
    3n. If you enable/disable the firewall does it change anything?
A: it can't be changed.
    3o. What frequency are you using (2.4GHz, 5GHz, etc.)?
A: 2.4 GHz
    3p. If you change frequency does it change anything?
A: no
Does another wireless device tested with the AP have the same problem as the hardware you initially reported with?
A: bluetooth is working. wifi is not.
What is the distance of the wireless device from the AP?
A: 2 metres
What is the number and type of obstructions between your device and the AP?
A: no obstruction

    6a. If you bring the device close to the AP and eliminate obstructions, does this change anything?
A: no
Does the issue occur with different APs?
A: no
Is it a regression (i.e. did the problem happen in a prior Ubuntu release)? If so, what release specifically did it last work with? If you do not know, could you please test for this in the earliest release of Ubuntu that is supported as per Ubuntu Releases?
A: used it for the first time

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
$ apt-cache policy pkgname
N: Unable to locate package pkgname

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-32-generic 3.13.0-32.57 [modified: boot/vmlinuz-3.13.0-32-generic]
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: rricha 1731 F.... pulseaudio
 /dev/snd/controlC1: rricha 1731 F.... pulseaudio
CurrentDesktop: Unity
Date: Thu Jul 23 10:16:55 2015
HibernationDevice: RESUME=UUID=ffd9c5d8-8239-49c4-8e36-dbdebd5ffb9a
InstallationDate: Installed on 2015-07-21 (1 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
IwConfig:
 eth0 no wireless extensions.

 lo no wireless extensions.
MachineType: Acer Aspire E5-573
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=83c1bfa9-c9a6-4165-a5ce-e7e7a3bdc549 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-32-generic N/A
 linux-backports-modules-3.13.0-32-generic N/A
 linux-firmware 1.127.5
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/20/2015
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.11
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: ZORO_BH
dmi.board.vendor: Acer
dmi.board.version: Type2 - A01 Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.11:bd04/20/2015:svnAcer:pnAspireE5-573:pvrV3.72:rvnAcer:rnZORO_BH:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.name: Aspire E5-573
dmi.product.version: V3.72
dmi.sys.vendor: Acer

[Brad Figg (brad-figg)]

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