[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:desktop-source-catalogs into livecd-rootfs:ubuntu/master

[Sebastien Bacher]

Review: Needs Information

Oh, just another comment, the update-source-catalog change doesn't seem to part of building the desktop catalogs, maybe should be a different commit?
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/408449
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