Siempre en los labs de la PUCP y otras laps en mi camino (es más cuando pido lap para dar mis charlas) me facilitan laps con Ubuntu 12.04 con Unity, y bueno en tres, dos, uno… debo cambiarlas a GNOME 3.x :p… encontré un blog donde estań las tres superlíneas de comando que hacen la magia:
sudo add-apt-repository ppa:gnome3-team/gnome3
sudo apt-get update
sudo apt-get install gnome-shell
About Julita Inca
System Engineering degree at UNAC, Computer Science Masters at PUCP, High Performance Masters at University of Edinburgh, Winner OPW GNOME 2011, GNOME Foundation member since 2012, Fedora Ambassador since 2012, winner of the Linux Foundation scholarship 2012, Linux Admin at GMD 2012, IT Specialist at IBM 2013. Academia experience in lecturing at PUCP, USIL and UNI Peru (2010-2018).
HPC intern at ORNL 2018. HPC Software Specialist at UKAEA in 2020. Research Community Lead since 2023 at Queen Mary University of London.
Tech Certifications: RHCE, RHCSA, AIX 6.1, AIX 7 Administrator, and ITILv3. Leader of LinuXatUNI Community, Creator of the "Mujeres Imperfectas | I'm perfect woman" channel, Reviewer of the Technological Magazine of ESPOL-RTE, Online trainer at BackTrackAcademy, blogger, photographer, IT-Linux-HPC-science worldwide speaker, graphic designer, researcher, content creator, press communicator... a simple mortal, just like you!
Sólo para Mí! 
But today no one or few people use this version of ubuntu, what can i do if i have a later than 12 ?
Saludos
It is great to see your greetings in Spanish :3… then, just be sure you choose the right option to start GNOME or Unity. It is going to be displayed the moment you log in into your laptop. Hugs Leitou!