Meta + E opens disk analyzer in Ubuntu instead of file explorer

Run this command to fix:
xdg-mime default nemo.desktop inode/directory

How to install the latest cinnamon on Ubuntu 16.04

sudo add-apt-repository ppa:embrosyn/cinnamon

sudo apt update
sudo apt install cinnamon 

How to fix missing desktop icons under Cinnamon

sudo apt remove --purge nautilus
xdg-mime default nemo.desktop  inode/directory