Missing icons
 

Since I updated Ubuntu 64-bits to the latest stable version (from 11.04 to 11.10) many icons went missing. In attachment I am sending you an example of that with my Desktop (some noise inserted for privacy reasons).

Can you help fixing this?

Are the apps missing?
Can you start the apps from a command line?
try right clicking on a empty space on the desktop and choose create launcher.

Only the icons are missing. I can still open everything with a double-click or right-click + open.

Most part of the icons was fixed using

sudo apt-get install gnome-tweak-tool

but there is still one that was not corrected - the "Alternador de Áreas de Trabalho". I believe this one had the problem still in Ubuntu 11.04.

Can you help?

Try using the launcher (see post #2).

The workspaces switcher (Alternador de Áreas de Trabalho) works, the only problem is that it has no icon.
Right-clicking on an empty space on the desktop does not provide any option to create a launcher.

Any clues?