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This question already has an answer here:

So I changed back to Ambiance from the Macbuntu theme, but the window border is still the Macbuntu one, I have looked and none of the other questions work on 16.04, so how do I change the window border back to the Ambiance one? enter image description here

marked as duplicate by andrew.46, David Foerster, Eric Carvalho, Kevin Bowen, Aaron Oct 10 '16 at 15:00

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To change window border in GNOME Flashback (Metacity) you will need to do it from terminal:

gsettings set org.gnome.metacity theme Ambiance

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