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cat /etc/lsb-release
DISTRIB_ID=Ubuntu DISTRIB_RELEASE=16.04 DISTRIB_CODENAME=xenial DISTRIB_DESCRIPTION="Ubuntu 16.04.3 LTS"
sudo sed -i 's/raring/trusty/g' /etc/apt/sources.list
sudo apt-get update && sudo apt-get dist-upgrade
sudo apt-get install --reinstall xubuntu-desktop
sudo update-grub
sudo update-initramfs -u