Thanks for the crash file and sorry for the slow response. From the
crash file:

   Volume group "ubuntu-vg" has insufficient free space (6271 extents):
6272 required.

We are only off by one! I think the lesson here is that we need to be
more careful about LV sizes, this code is basically assuming one can
take the size of the VG, divide it by two and create two LVs of that
size but that's not really true, you can only create LVs whose size is a
multiple of the extent size, which is by default 4MiB (and subiquity
does not allow controlling this).

** Changed in: subiquity (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1935969

Title:
  Ubuntu 20.04.2 LTS installer crash when letting the system determine
  size of additional LV

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