Seems had issue with particular update. After updating Ubuntu to new version solved the issue.
Thanks for your reply -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1786516 Title: Ubuntu taking screenshot at random times, keybaord down arrow maps to "q" and sometimes work fine. Status in firefox package in Ubuntu: Expired Bug description: I am running ubuntu 18.04 and my pc taking screenshots at random and saving in Pictures folders. also i observer my keyboard down arrow key maps to "q" and sometimes works fine. Not sure what is happening here. it is all random. Please advise. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: firefox 61.0.1+build1-0ubuntu0.18.04.1 ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18 Uname: Linux 4.15.0-29-generic x86_64 NonfreeKernelModules: kpatch_livepatch_Ubuntu_4_15_0_29_31_generic_41 AddonCompatCheckDisabled: False ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: sudeep 3883 F.... pulseaudio /dev/snd/controlC0: sudeep 3883 F.... pulseaudio BuildID: 20180704192850 Channel: Unavailable CurrentDesktop: ubuntu:GNOME Date: Fri Aug 10 22:04:53 2018 ExecutablePath: /usr/lib/firefox/firefox Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) IpRoute: default via 192.168.0.1 dev wlp2s0 proto dhcp metric 600 192.168.0.0/24 dev wlp2s0 proto kernel scope link src 192.168.0.105 metric 600 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown Locales: extensions.sqlite corrupt or missing MostRecentCrashID: bp-101a5869-fe29-4f41-be1d-ba91f1180216 PrefErrors: Unexpected character ',' whilst parsing int @ /usr/lib/firefox/defaults/pref/vendor-gre.js:8 PrefSources: prefs.js ProcEnviron: LANGUAGE=en_IN:en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_IN SHELL=/bin/bash Profiles: Profile0 (Default) - LastVersion=61.0.1/20180704192850 (In use) RunningIncompatibleAddons: False SourcePackage: firefox SubmittedCrashIDs: bp-101a5869-fe29-4f41-be1d-ba91f1180216 Themes: extensions.sqlite corrupt or missing UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/23/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: A19 dmi.board.name: 0TR3VC dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA19:bd01/23/2018:svnDellInc.:pnLatitudeE5550:pvr:rvnDellInc.:rn0TR3VC:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E5550 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1786516/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp