Please recommend me what kind of updates are not needed.
Most likely there are no updates for your system at the moment. Looks for me like normal behaiviour of ubuntu-ubdate. If youre impatiant you may hit the "check" button. Then your software database may get new entries to install via update-manager
Sorry of course it is update-manager and not ubuntu-update. its the prog wich are shown in your first post
You can try clearing apt-get's cache and forcing it to redownload the package list by running the following commands:
This will force it to redownload the package lists, giving you the latest and greatest packages from the server.
You DO know the difference between