sudo nano /etc/grub.d/grub
Find the line that says- GRUB_CMDLINE_LINUX and add (inside the quotes) processor.ignore_ppc=1
Hit < Control >
reboot and you should be fine
sudo add-apt-repository "deb http://repo.mate-desktop.org/ubuntu $(lsb_release -sc) main"
sudo apt-get update
sudo apt-get --yes --quiet --allow-unauthenticated install mate-archive-keyring
sudo apt-get update
sudo apt-get install mate-core
sudo apt-get install mate-desktop-environment