Actually, it appears this installer variant won't install to LVM at all,
even if you precreate the LV.
** Package changed: debian-installer (Ubuntu) => subiquity
** Changed in: subiquity
Status: Confirmed => New
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: debian-installer (Ubuntu)
Status: New => Confirmed
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1771393