Make nemo the default file browser

There is a much better way to do this without moving files and setting links. Just open a terminal with CTRL+ALT+T and perform this command:

xdg-mime default nemo.desktop inode/directory application/x-gnome-saved-search

Then set up Nemo to handle your desktop:

gsettings set org.gnome.desktop.background show-desktop-icons false
gsettings set org.nemo.desktop show-desktop-icons true

Revert this changes:

gsettings set org.gnome.desktop.background show-desktop-icons true
gsettings set org.nemo.desktop show-desktop-icons false
xdg-mime default nautilus.desktop inode/directory application/x-gnome-saved-search

Open your terminal with CTRL+ALT+T and then paste this:

 sudo mv /usr/bin/nautilus /usr/bin/nautilus.back && sudo ln -s /usr/bin/nemo /usr/bin/nautilus

then try again, hope that helps.

Note that this will effectively make Nautilus inaccessible on your system unless you modify shortcuts to point to nautilus.back.