If you want to transform your Ubuntu into the Macbook style desktop environment then macOS high Sierra GTK theme is the best theme for you. High Sierra GTL theme is a Mac OSX like theme for GTK 3, GTK 2 and Gnome-Shell which supports GTK 3 and GTK 2 based desktop environments like Gnome , XFCE, Mate, Pantheon etc.
How To Install macOS High Sierra GTK Theme In Ubuntu 18.04
Open your terminal in Ubuntu and execute the following command to install Sierra GTK theme.
Download the theme file from the link below:
Now install the gtk theme with the help of following steps:
Extract the zip file which you have downloaded to the themes directory i.e.
If you are a GNOME user, execute the following command in your terminal:
gsettings set org.gnome.desktop.interface gtk-theme "macOS High Sierra" gsettings set org.gnome.desktop.wm.preferences theme "macOS High Sierra"
To set the theme in Xfce, run the following commands in Terminal,
xfconf-query -c xsettings -p /Net/ThemeName -s "macOS High Sierra" xfconf-query -c xfwm4 -p /general/theme -s "macOS High Sierra"