[Merge] lp:~ubuntu-mate-dev/ubiquity-slideshow-ubuntu/ubuntu-mate-update into lp:ubiquity-slideshow-ubuntu

[Didier Roche]

Oh, seems I don't have write access, for upstream: I pushed it to lp:~didrocks/ubiquity-slideshow-ubuntu/mate-slideshow. Please grab to reconcile branches.
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https://code.launchpad.net/~ubuntu-mate-dev/ubiquity-slideshow-ubuntu/ubuntu-mate-update/+merge/259371
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