Pretty much confirming the suspicion of it not being Ubiquity to blame, using alternate install (server install system). On a completely removed and recreated LVM, no problem. When I asked for 'side by side, it told me that vda was still mounted. Just following the unmount prompt allows me to proceed fine. Sorry for being late; I've had a couple of days off and wanted to check an actual install, as opposed to relying on my memory. Regards, Phill.
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