Comment 7 for bug 899648

No, what said in #6 is not correct.
After running another apt-get update, I got update notifier notifying me that I had 2 updates to install, but when I tried to install them with update manager, I got the same problem that it does not install the updates.
So I tryed in terminal as root user:
apt-get upgrade

and the updates got installed, looks like I can only install updates from command line.