Interesting tidbits from Cosmic (U18.10), running with `splash` removed
from boot arguments (i.e. disable Plymouth splash).

Boot LUKS prompt display:

   sed: /conf/conf.d/cryptroot: No such file or directory

     ... (unrelated LVMeta'd warning)

   /scripts/local-top/cryptroot: line 218: fold: not found
   Please unlock disk sda3_crypt:

Okay, still not clear why yubikey-luks isn't working, but at least
there's an error or two now. :-)

I then tried both enabling chatty mode (`quiet` removed) and breaking
before mount phase in initramfs bringup (`break=premount` added) to do
some further digging.

The only reference within the as-built initramfs to
`/conf/conf.d/cryptroot` anywhere in `/scripts/` is `/scripts/local-top
/yubikey-luks`, and that file is noticeably absent from `/conf/conf.d/`.
I saw that in bug 317442 (yes, old bug) that there may be situations
where this file might not be created.

Line 218 of `/scripts/local-top/cryptroot` is the ending of an if-fi
block, not clear yet what `fold` references.

Net-net, still digging.

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https://bugs.launchpad.net/bugs/1619921

Title:
  Password Prompt for yubikey not showing in Plymouth

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