Change the default File Manager in linux
The below code will setup nemo as the default file manager.
xdg-mime default nemo.desktop inode/directory application/x-gnome-saved-search gsettings set org.gnome.desktop.background show-desktop-icons false gsettings set org.nemo.desktop show-desktop-icons true
xdg-mime query default inode/directory: nemo.desktop
This will open the home directory using the current default file manager.
If nautilus or any other file manager is still the default file manager or web browsers are still using the other file manager other than nemo then just rename the binary file.
In my case I wanted to replace nautilus to nemo so I renamed nautilus
sudo mv /usr/bin/nautilus /usr/bin/natilus.bak
You can rename it back to its original name after if you want.
If everything fails then you can also replace nautilus all together by creating a sym link of nemo
sudo ln -s /usr/bin/nemo /usr/bin/nautilus