[Merge] ~rbalint/livecd-rootfs:wsl-cosmic into livecd-rootfs:ubuntu/cosmic

[Robert C Jennings]

Review: Needs Information

This will include ~150MB for preseeding the lxd snap which at present can not be used in wsl1.  We need to close on this feature before inflating the image size.  I suggest using the eoan image to develop that feature and backport when ready.
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https://code.launchpad.net/~rbalint/livecd-rootfs/+git/livecd-rootfs/+merge/367404
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