The following instructions are tested on my Ubuntu 16.04 Xenial environment.
Download macOS Sierra GTK Theme from Github. In my case, I download “OS.X.El.Capitan.v0.9.tar.gz“. Extract the tar file and copy the extracted directory into your “
/.themes” directory. If “/.themes” doesn’t exist, create it first.
Download La Capitaine Icon Set on Github. In my case, I download “la-capitaine-icon-theme-0.4.0.tar.gz“. Extract the tar file and copy the extracted directory into your “
/.icons” directory. If “/.icons” doesn’t exist, create it first.
Clone the “capitaine-cursors” project from here. Copy the cursors by running the “cp -pr bin/xcursor ~/.icons/capitaine-cursors” command.
Open “Unity Tweak Tool”, change theme in “Appearance -> Theme”, icon in “Appearance -> Icons”, and cursor in “Appearance -> Cursors”.
sudo add-apt-repository ppa:papirus/papirus