If for example you run this command from the terminal:
You will notice that the user interface of the Nautilus file manager is "ugly". With just few commands, you can fix all this by running the following commands from the terminal:
sudo ln -s ~/.fonts /root/.fonts
sudo ln -s ~/.icons /root/.icons
sudo ln -s ~/.themes /root/.themes
These commands will create symbolic links pointing to your current theme, icon and font installed in Ubuntu.