I installed Unity as default DE on Ubuntu 18.04, But nautilus really sucks on desktop management.
So I decide to make a change.

First, Install nemo file manager

sudo add-apt-repository ppa:webupd8team/nemo3

Even through this PPA is not support Ubuntu 18.04 yet, But you can still use it by change it to "artful".

then:

sudo apt update
sudo apt install nemo

Next thing to do is set Nemo to default file manager&Desktop manager.

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

Add "nemo-desktop" to system autostart up and reboot system.

Then you had the future in your hands.