I installed a Ubuntu 15.10 and GNOME session. The installation was successful but when I restart Ubuntu I see only this and it does not load.How can I solve it?I do not want to install Ubuntu with gnome preinstalled, because all of these versions make my internet slow!
Not knowing how you installed Gnome, I'm guessing something went wrong there.
Please try installing the ubuntu-gnome-desktop package:
Then reconfigure gdm:
It solved a similiar issue in gdm not working with Ubuntu 15.10