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Using 12.10, I can apply all but the last line in this answer: How do I change fonts and adjust their size? to change font sizes.

gsettings set org.gnome.desktop.interface document-font-name 'Sans 10'
gsettings set org.gnome.desktop.interface font-name 'Ubuntu 10'
gsettings set org.gnome.desktop.interface monospace-font-name 'Ubuntu Mono 11'
gsettings set org.gnome.nautilus.desktop font 'Ubuntu 10'
gconftool --set /apps/metacity/general/titlebar_font 'Ubuntu Bold 10' --type STRING

The last line referencing gconftool has no effect on window title font size. What is the correct command?

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The method described in that answer is for Ubuntu 11.10 so if you're running anything newer it probably won't work. Please add a tag or edit your answer to say which version of Ubuntu you are running and the community can try to help :) – lordqwerty Feb 21 '13 at 22:13
up vote 3 down vote accepted

The settings are in gsettings now. This should do it:

gsettings set org.gnome.desktop.wm.preferences titlebar-font 'Ubuntu 10'

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That did the trick. Thanks. – MikeV29 Feb 21 '13 at 21:37

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