I know that this feature is already in Ubuntu since few version but I didn't saw it in any version of Ubuntu. I'm using regular Ambience window style but I can't set rounded corners. All windows look like this: 
How make rounded corners?
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QkiZ
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Important: what version of Ubuntu are you using. 18.04 is using gnome 3. Gnome 3 has a lot less features than Unity (which got abandoned). – Rinzwind Apr 28 '18 at 18:02
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I don't know why you mentioned about Unity. I'm writing about Gnome3. – QkiZ Apr 29 '18 at 05:37
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I had file that overwrites settings from theme. It was in /home/user/.config/gtk-3.0/gtk.css. When I deleted this file square corners disappear without any action (reboot or relogin). I don't know what created this file but I'm using the same profile for 10 years.
QkiZ
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