I just found out, a fix has been committed upstream:
https://bugzilla.gnome.org/show_bug.cgi?id=755794
Until it reaches 'Wily', I patched my local gnome-tweak-tool with the
following patch:
https://bugzilla.gnome.org/attachment.cgi?id=312364&action=edit
** Bug watch added: GNOME Bug Tracker #755794
https://bugzilla.gnome.org/show_bug.cgi?id=755794
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https://bugs.launchpad.net/bugs/1509531
Title:
gnome-tweak-tool fails to start in Ubuntu 15.10 (Wily Werewolf)
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