Looks like it's really the appstream update that failed:
Mar 24 11:04:30 kubuntu ubiquity: ** (appstreamcli:7490): CRITICAL **: Error
while moving old database out of the way.
Mar 24 11:04:30 kubuntu ubiquity: AppStream cache update failed.
The warning you saw earlier should be fixed in the next image; perhaps
it would be best to see if the next daily solves the issue for you, and
if not we'll look more into the appstream issues.
As far as I recall, appstream was pretty picking about the signing.
** Changed in: ubiquity (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1561472
Title:
Xenial Beta 2: Installation fails due to insufficiently signed
repository
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