I did some more research and found the following which might help the developers to look for the bug.
Previously xev command at the terminal did not give response to Delete, Home, PgUp, PgDn,End, Left Arrow or Right Arrow keys. All the other keys functioned as normally they should. I did mapping of the problematic keys (barring PgUp and PgDn) to Function Keys F06, F08, F09, F11 and F12 and managed it for my purposes successfully. I had to perform a hardware check of the keyboard to be sure it was not a case of defective keyboard (and the bug exists in Ubuntu 16.04.3). The hardware man is expected to come tomorrow. Meanwhile I did some major changes in Language Support from English US to English United Kingdom and lo and behold the keys began to respond. I have yet to confirm Left and Right Arrow keys though. SO IT SHOWS THAT IT IS NOT A HARDWARE ISSUE. The xev command also identified the keys. This, I hope, helps the developers. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to libreoffice in Ubuntu. https://bugs.launchpad.net/bugs/1716300 Title: Home, Pg Up down keys and arrow keys not funtioning in LibreOffice Status in libreoffice package in Ubuntu: New Bug description: File Bug is attached because the description is long. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: libreoffice 1:5.1.6~rc2-0ubuntu1~xenial2 ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11 Uname: Linux 4.8.0-36-generic i686 ApportVersion: 2.20.1-0ubuntu2.10 Architecture: i386 CurrentDesktop: Unity Date: Mon Sep 11 06:02:17 2017 InstallationDate: Installed on 2017-09-10 (0 days ago) InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release i386 (20170215.2) SourcePackage: libreoffice UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1716300/+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