applications does't appear on the task panel

I forget.
Ubuntu version: 10.04 Beta1

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please ctrl alt t terminal: gnome-panel. ==enter.
do not close the terminal. go to synaptic manager or update manager, update your system, reboot.

boot into recovery mode and then select the third option ie fix broken packages,,,it will update and upgrade the system and clear all broken dependencies issues.
Thanks

I've got the same problem on a fresh installation of Lucid official release.

I've followed the solution by Rajinder but il doesn't fixed the problem.

In the solution by Leoquant I don't understand what to type in the terminal: this is meaningless: "gnome-panel. ==enter"

If I type only gnome-panel, I get this:

philippe@linux-ubuntu-bqf:~$ gnome-panel
Cannot register the panel shell: there is already one running.

Could anyone help me?

If I open a guest session then the applications buttons do appear in the bottom panel!

I've tried to reinstall gnome-panel and gnome-panel-data but this didn't changed anything.

I've found the solution here:

http://ubuntuforums.org/showthread.php?t=407350

Right click on the panel / select "Add to Panel" / "Windows List" then "Add".