Fix: HP ProBook 4540 Freezing with Ubuntu 12.04

It is quite frustrating when you are in the middle of something and your laptop just freezes. I used to experience it a lot with my brand new HP ProBook 4540s running Ubuntu 12.04 LTS precise with all the latest updates and patches. I used to get the “Sorry, Ubuntu 12.04 has experienced an internal error.” sort of errors all the time. Searched high and low on the internet as well as HP forums but with no luck.

The day when i upgraded to the Ubuntu 12.10 quantal, the problem has just vanished as if it was never there :) So if your Sandy Bridge based system (or any other sort of latest hardware) and you are experiencing frequent errors and freezes its suggested to updgrade to ubuntu 12.10 quantal. Seems like its has better support for new hardware, thanks to the new kernel.

Fix: sssd not authenticating in ubuntu 12.10

The version of sssd (1.9.1) shipped with default Ubuntu 12.10 is broken. It fails while communicating with ldap server over StartTLS. In order to make it work it has to be updated to the latest stable version 1.9.4 (at the time of writing) either from the source https://fedorahosted.org/sssd/ or an easier approach would be to download from ppa:

 sudo nano /etc/apt/sources.list 

add the following ppa to the sources.list

deb http://ppa.launchpad.net/sssd/updates/ubuntu quantal main deb-src http://ppa.launchpad.net/sssd/updates/ubuntu quantal main

and then do an update and install

sudo aptitude update 

sudo aptitude install sssd