I'm running Ubuntu 10.10. The update manager came up the other day. However, when I hit the "Authenticate" button, nothing happens --- I've let it sit for about 5 min?
Known issue https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/445303 You have to wait for this bug to be fixed.
For now use
in Terminal ( https://help.ubuntu.com/community/UsingTheTerminal )
This simply does the same thing as update manager does - it installs newest versions of the packages on the system. Using the commands above is equivalent to using update manager and does not do upgrades of the system version - if you are on 10.10, it would stay so.
Alternatively you can use synaptic to do the updates - press "mark updates" and "apply" toolbar buttons to do the job. More documentation (including an install howto, you will need to