After installing nemo file manager, check if nautilus if the default file manager (usually the case):
xdg-mime query default inode/directory nautilus-folder-handler.desktop
Change default file manager for Ubuntu to nemo from nautilus:
xdg-mime default nemo.desktop inode/directory application/x-gnome-saved-search
Joel G Mathew, known in tech circles by the pseudonym Droidzone, is an opensource and programming enthusiast.
His favorite pastime is grappling with GNU compilers, discovering newer Linux secrets, writing scripts, hacking roms, and programs (nothing illegal), reading, blogging. and testing out the latest gadgets.
When away from the tech world, Dr Joel G. Mathew is a practising ENT Surgeon, busy with surgeries and clinical practise.