How can I remove "Ubuntu Netbook Edition" option from the GDM session menu?

Solution 1:

Go to the Ubuntu Software Center and use the search box in the upper right corner. Search for ubuntu-netbook and remove the packages ubuntu-netbook and ubuntu-netbook-default-settings.

Solution 2:

The list is populated by looking at the contents of the /usr/share/xsessions directory. In here you’ll find files with the .desktop extension (extension hidden in some file managers, press CTRL+H). As these files are in a system folder, you will need root privileges to change or delete them.