If you’re thinking about using Nemo file manager as default, here is how to make it default.
Go to preferred apps in your menu and choose files or if you’re using Xfce choose other then in the box that comes up type in nemo small letters.
Put these commands in terminal one at a time.
This command enables you to open nemo in Terminal
gsettings set org.cinnamon.desktop.default-applications.terminal exec then name of terminal you’re using that you can find the name of either in about under help in the terminal, or the long way in /usr/share/applications. I use Xfce-terminal. Why Linux Mint does not use their nemo file manager through out their environments is beyond me?
This next command makes nemo take control of icons on the Desktop
gsettings set org.gnome.desktop.background show-desktop-icons false
This last command makes nemo fully default search
xdg-mime default nemo.desktop inode/directory application/x-gnome-saved-search
These commands work in every Linux environment. Though Ubuntu-Mate looks weird to me with nemo.