Install LXDE desktop

sudo apt-get remove -y unity ubuntu-desktop
sudo apt-get install -y lubuntu-desktop lxde
sudo reboot

purge will erase network-manager and sudo.

sudo su -
aptitude purge -y `dpkg --get-selections | grep gnome | cut -f 1`
aptitude -f install -y
aptitude purge -y `dpkg --get-selections | grep deinstall | cut -f 1`
aptitude -f install -y
apt-get install -y lxde lightdm
apt-get install -y sudo network-manager
systemctl enable lightdm.service
reboot

sudo dnf remove -y gnome-desktop gnome-desktop3
sudo dnf groupinstall -y "LXDE Desktop"
sudo dnf install -y lightdm
sudo systemctl enable lightdm.service
sudo reboot

• Mate desktop
• Xfce desktop