WIFI not working on Acer Aspire E5-573

[santosh]

I have following wifi card:

03:00.0 Network controller [0280]: Qualcomm Atheros Device [168c:0042] (rev 30)
 Subsystem: Foxconn International, Inc. Device [105b:e09a]

I have installed ubuntu14.04 LTS. wifi is not working. please fix this problem.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.19.0-66-generic 3.19.0-66.74~14.04.1
ProcVersionSignature: Ubuntu 3.19.0-66.74~14.04.1-generic 3.19.8-ckt22
Uname: Linux 3.19.0-66-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Aug 10 16:23:56 2016
InstallationDate: Installed on 2015-10-24 (291 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: linux-lts-vivid
UpgradeStatus: No upgrade log present (probably fresh install)