Ubuntu window panel dispear

Ubuntu 10.4
First, try open a gnome-terminal

test@test-desktop:~$ gnome-panel
gnome-panel: error while loading shared libraries: libtdb.so.1: cannot open shared object file: No such file or directory

It seems the libtdb.so.1 is missing, look for the package that contains the library, and reinstall it.

test@test-desktop:~$ dpkg -S libtdb.so.1
libtdb1: /usr/lib/libtdb.so.1
libtdb1: /usr/lib/libtdb.so.1.2.0
test@test-desktop:~$ apt-get install --reinstall libtdb1