I have removed accidently i32-libs... using the following command
sudo apt-get remove ia32-libs
Now the GUI is not properly working. How can I fix this?
Execute sudo apt-get install ubuntu-desktop --reinstall
to make sure all required libraries are there and potentially fix it.
Check /var/log/dpkg.log what packages have been installed/removed since. This command may help to figure out what happened:
$ grep remove /var/log/dpkg.log