Thread: New install 12.04.2 LTS works fine, but hangs after upgrade

hi have (brand new) installed ubuntu 12.04.2 lts 64 bit pc. can browse web, open documents, etc, until run updates.

run update manager , apply updates, system needs reboot.

system still boots ok. hang after 5 mins after logging in.

if don't login, happily wait @ login screen indefinitely; it's after login system hangs.

observations:
- mouse pointer still moves around, else hangs, screen totally unresponsive except mouse pointer.
- nothing else has been installed, off cd (and usb) , applied updates.
- tried installing both usb , cd, no difference
- confirmed md5 sums on downloaded iso a-ok (also tested cd defects before installing).
- no fancy partitioning, straight defaults
- motherboard asustek p8p67
- cpu intel g550 @ 2.60ghz
- graphics card appears intel on board h61 thing (no additional separate graphics card).
- 4 gb ram
- tried xubuntu, same symptoms: install well, run updates, updates work fine, reboot system, login, hangs.
- tried turning off updates except required security updates, still behaviour.
- tried turning off desktop compositing, no difference behaviour, still hangs after updates.

- installed ubuntu server (is non gui of course!) 12.04.2 lts 64 bit, fine, updates fine, works ok. issue gui related!

research points similar behaviour being related buggy nvidea video drivers, have no fancy cards, using vanilla intel h61 on board video, don't think applies in case (i can't change 3rd party drivers none in use).

please advice, or how might track/debug causing this.

thank you
mark

please run these, 1 after other, in terminal:

code:

sudo apt-get update sudo apt-get upgrade

the second command not upgrade distribution next release, upgrade software in current release needs upgrading. reboot , see happens.

ps: never run second command itself. update before 'sudo apt-get upgrade'.

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