Customize Ubuntu : Make login screen look like Mac Os login screen
Make Ubuntu login screen look like Mac OS login screen. Customize Ubuntu in few steps. Works flawlessly with Ubuntu 17.10 and later.
To download theme: https://www.gnome-look.org/p/1207015/
No extra tools required. You can try other themes also using similar procedure.
— for getting default GDM theme back use this command
sudo cp /usr/share/gnome-share/theme/ubuntu.bak /usr/share/gnome-share/theme/ubuntu.css
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