Sometimes your Ubuntu shows message that the panel is error and suddenly you cannot see the panel bar. This is the step to bring Kubuntu panel back:
1. Open Terminal
2. Install configuration tool for gnome
This installed tool is used to set all preferences back to default for the application "panel"
:~$ sudo apt-get install gconf2
Reading package lists... Done
Building dependency tree
Reading state information... Done
gconf2 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 65 not upgraded.
:~$ gconftool-2 --recursive-unset /apps/panel
3. Remove everything below gconf/apps/panel
:~$ rm -rf ~/.gconf/apps/panel
4. Close application gnome-panel
:~$ pkill gnome-panel
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