[Trisquel-users] Re : Unable to Access Some Features

[lcerf]

Click on the icon at the right of your user name on the graphical login  
screen. You can then choose a "GNOME" session.

I always advise to read https://wiki.gnome.org/Projects/GnomeShell/CheatSheet  
to discover useful keyboard shortcuts. And it is worth knowing  
http://extensions.gnome.org for any customization of the default interface (a  
classic desktop can even be obtained in this way, if you want).