The only message like this which appears in the cryptsetup source for
any of cosmic, disco, and eoan is this call in debian/functions:
cryptsetup_message "WARNING: Option '$o' missing in crypttab
for plain dm-crypt" \
"mapping $CRYPTTAB_NAME. Please read
/usr/share/doc/cryptsetup/README.initramfs and" \
"add the correct '$o' option to your crypttab(5)."
This message is only displayed for non-LUKS entries, but your crypttab
shows that you are using LUKS.
And I have been using LUKS-based encrypted root across all these Ubuntu
releases and have never seen this warning message at boot.
Can you please confirm the text of the message that you are shown, and
the version of the cryptsetup package you have installed?
Also since this is only a warning message which per your description
does not block boot even when it does show up, I'm marking this bug as
'low'.
** Changed in: cryptsetup (Ubuntu)
Importance: Undecided => Low
** Changed in: cryptsetup (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1804314
Title:
Wrong WARNING Option 'hash' missing in crypttab
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