Ubuntu 11.10 is installed, and I have updated my system via Ubuntu Software Centre, and after the update 3 updates remain in the list. But I am unable to select them, the tickboxes cannot be checked and Ubuntu Software Centre gives no error when I try to check.
Also, below it says "There is no update to be installed" and even though there seems to be updates Install Updates button is unclickable.
What should I do in order to install these updates?