I was facing the same issue, found this (less invasive way) to work:
Code:
sudo nano /usr/share/themes/Ambiance/metacity-1/metacity-theme-1.xml
And edit the attributes below:
Code:
<!-- General window layout -->
<frame_geometry name="frame_geometry_normal" title_scale="medium" rounded_top_left="true" rounded_top_right="true" rounded_bottom_left="false" rounded_bottom_right="false">
<distance name="left_width" value="3"/>
<distance name="right_width" value="3"/>
<distance name="bottom_height" value="3"/>
3 seemed to work well for my hi res laptop screen, 5 was a bit too much.
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