This was fixed in Ubuntu MATE 16.10.
** Changed in: mate-tweak (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1576697
Title:
package mate-tweak
If package gir1.2-gtk-3.0 is not installed and mate-tweak is called from the
command line, it produces the following error message:
Traceback (most recent call last):
File "/usr/bin/mate-tweak", line 39, in
gi.require_version('Gdk', '3.0')
File