[Bug 1989205] Re: Autoinstall configuration works in 20.04.3, but not in 20.04.4 and 20.04.5

[Dan Bungert]

** Package changed: curtain (Ubuntu) => subiquity (Ubuntu)

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Title:
  Autoinstall configuration works in 20.04.3, but not in 20.04.4 and
  20.04.5

Status in subiquity package in Ubuntu:
  New

Bug description:
  Hello,

  I have an [autoinstall
  configuration](https://pastebin.ubuntu.com/p/YbpJscsNWR/) I am testing
  that works in 20.04.3, but fails in 20.04.4 and 20.04.5. It fails in
  the same dm-crypt section. I suspect it has to do with my usage of
  "-1" size in the dm-crypt section. In 20.04.3, the partitions are
  sized as expected, but 20.04.4/20.04.5 fail to install. My goal is to
  have the encrypted partition fill the rest of the available disk.

  The successful autoinstall user-data info from the 20.04.3 release is
  [here](https://pastebin.ubuntu.com/p/THQNvTzb4s/), and the curtin
  error log from a 20.04.5 install is attached. If there is anything
  else needed, I am happy to provide it.

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