Bug#1000230: screenruler fails to start

[Peter Mueller]

Dear George,
On one of the two Debian-stable machines I manage libcanberra-gtk3-module is 
installed:
$ LANG=en_US.utf8 sudo aptitude show libcanberra-gtk3-module | egrep 
"(State)|(Version)" Version: 0.30-7 State: installed
On this machine, screenruler works. I'll check the other machine in several 
days and let you know.