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

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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.

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: autoinstall bot-comment curtin subiquity
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Autoinstall configuration works in 20.04.3, but not in 20.04.4 and 20.04.5
https://bugs.launchpad.net/bugs/1989205
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