Security updates for Debian / Ubuntu

In view that now malware threats is extending to other non-Windows platform, like recently on MAC OS X, the flashback trojan, it should be on higher alert to linuxes too.

For Ubuntu, besides using Update Manager to do it for you, one of the way is to get security updates, eg from Debian Security. >>> This won't work. As you couldn't get trust certificates so that the patch be applied to Ubuntu. You need to use Ubuntu Security Update

Simply add a line like this to your apt:

deb http://security.debian.org/ squeeze/updates main contrib non-free

You can use apt to easily get the latest security updates. This requires a line such as

deb http://security.debian.org/ squeeze/updates main contrib non-free

in your /etc/apt/sources.list file. Then execute apt-get update && apt-get upgrade to download and apply the pending updates. 

instead, get automatic security update for Ubuntu

Go to Update Manager, 
Click the settings button on the lower left

go to "Updates" Tab

Click "Important Security Updates"

type in"deb http://security.debian.org/ squeeze/updates main contrib non-free" and When there is security updates, select "Download and install immediately"