Looks like you're not using updates repository. Go to menu System -> Administration -> Software Sources and go to Updates Tab and select "Recommended updates (jaunty-updates)".
After run update-manager again and update your system.
Looks like you're not using updates repository. Go to menu System -> Administration -> Software Sources and go to Updates Tab and select "Recommended updates (jaunty-updates)".
After run update-manager again and update your system.