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

[Martin Wimpress]

Please could someone review, and ideally merge it. I'd like to update the Ubuntu MATE 15.04 seeds and meta package prior to final beta so this can be fully tested :)
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https://code.launchpad.net/~ubuntu-mate-dev/ubiquity-slideshow-ubuntu/ubuntu-mate-update/+merge/253038
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