Install Xfce desktop

sudo apt-get remove -y unity ubuntu-desktop
sudo apt-get install -y xubuntu-desktop
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 xfce4 xfce4-goodies 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 "Xfce Desktop"
sudo dnf install -y lightdm
sudo systemctl enable lightdm.service
sudo reboot

sudo yum remove -y gnome-desktop gnome-desktop3
sudo yum install -y epel-release
sudo yum update -y
sudo yum --enablerepo=epel groupinstall -y "Xfce"
sudo yum install -y lightdm
sudo systemctl enable lightdm.service
sudo reboot

• LXDE desktop
• MATE desktop