lighted hangs on new 32bit 16.04 installation after list-upgrade

[Kevin]

Installed a 32bit laptop with Ubuntu 16.04. Installation worked fine, on initial login was prompted by Software Updater that additional updates were available - which was accepted.

These appeared to work fine without any issues, however after the subsequent reboot. Get the GUI prompting for a Password - which is entered. It them progresses (disk whirling), with the Ubuntu Wallpaper (mouse cursor occasionally shows and is moveable), however it hangs.

I am able to log on as the guest user, however not as the main user.

First error within the syslog following a reboot is around the free desktop / lightdm.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.2-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic i686
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: i386
Date: Thu Jul 21 16:48:08 2016
InstallationDate: Installed on 2016-07-19 (1 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Kevin (kiharris2002)]

Additional Information -

The bug has occurred on the same hardware a couple of times now. The installation of 16.04 works, and I am able to use the desktop.

It is the upgrade that introduce 16.04.1 onto the hardware that appears to cause the issues.

After upgrading I am prompted for a password which when entered, starts the desktop wallpaper, and then appears to hang.

Note that I am able to log onto the laptop using the Guest user, and can get to the desktop.

After reading around the 16.04.1 upgrade it appears that there are changes to the lightdm and gnome software - which appears to suggest that my hardware is having issues with these new packages, and potentially a 'permission' issues with the new packages.

[Kevin (kiharris2002)]

After re-installing back to 16.04, I managed to determine that the processes taking up the most memory an CPU were compiz and XOrg, which were at times making the laptop unresponsive. I read through a number of Forums, suggesting that Ubuntu 16.04 was using excessive amount of memory compared to previous releases (some suggesting that they had more memory than was in my old laptop).

  Consequently in order to get it running on 16.04 I have decided to migrate the server to Lubuntu 16.04, which seems a lot more responsive with the amount of memory and is sufficient for what I require. (I was hoping to use Ubuntu across all my old laptops).

  There is definitely a large increase in the use of resources on other laptops form 15.10 to 16.04, please don't replace Microsoft in using more and more resources with every release.