Conclusion thus far: What I am seeing might be a new breakage of
yubikey-luks in U18.10/Cosmic.
I dug up an older Ubuntu system (U16.04.3 LTS) that is known-working
with Yubikey LUKS + Plymouth, and `/conf/conf.d/cryptroot` is present in
initramfs. Contents is one line, a target specification for the root FS.
The line referencing it in `/scripts/local-top/yubikey-luks` looks
substantially similar to the one in U18.10 / Cosmic.
Digging through various versions of cryptsetup imported from upstream
(Debian), I see that between ubuntu/bionic and ubuntu/cosmic, generation
of `/conf/conf.d/cryptroot` seems to have been retired. Specifically, as
part of refactoring at:
debian/changelog
cryptsetup (2:2.0.3-2) unstable; urgency=medium
[ Guilhem Moulin ]
* debian/initramfs/*-hook: complete refactoring. Common functions are now
in
/lib/cryptsetup/functions (source-able from shell scripts).
(Closes: #784881.)
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=784881
… subsequent to which, debian/initramfs/cryptroot-hook add_device() (the
function which was responsible for constructing
`/conf/conf.d/cryptroot`) disappears.
Also of note: I fully removed yubikey-luks (`apt-get --purge remove
yubikey-luks`), and only the first of the two cryptroot errors I mentioned
above has disappeared. -- Looks like the "line 218" one is unrelated to
yubikey-luks.
** Bug watch added: Debian Bug tracker #784881
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=784881
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https://bugs.launchpad.net/bugs/1619921
Title:
Password Prompt for yubikey not showing in Plymouth
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