I've successfully set up Ubuntu (Kubuntu 22.04, to be more precise) as a secondary OS, next to Windows 10, on a LUKS-encrypted drive. (Single BTRFS partition in LUKS container)
I've not done this before, so it took me a few tries to get it to work. It's booting fine now, but anytime it asks me for the passphrase, I see a warning below the input field:
Ignoring unknown option: tries
This is what my etc-crypttab looks like:
# <target name> <source device> <key file> <options>
luks-<UUID> UUID=<UUID> none luks,tries=6
The line is obviously being read (also evidenced by the fact that if I edit it and change it to something wrong, I get no access at all to the LUKS partition), but something cannot deal with tries.
I'd really like to get more than the default 3 tries because my passphrase is pretty long, and I have to enter it on keyboards with different layouts, which means I have to type it "double-blind" (without seeing what I typed on-screen, but also without the correct labels on the keys I'm pressing). I've already run into the 3-retries limit once, which is how I know that the option is definitely being ignored.
What I tried so far:
Funny enough, the option seems to be completely congruent with the Debian crypttab manpage. The Debian manpage carries a warning it (the manpage, that is) is specific for Debian, and recommends also consulting the systemd version (and provides the link). The systemd version of the manpage also lists ´tries=n` as a valid option.
I had some hunch about having gotten the use of commas or spaces wrong, but any variation I tried either does nothing or breaks the setup.
My original attempt at setting up /etc/crypttab was based on an older how-to which uses the option retry -- but changing that also failed, and there are recent comments in the linked thread saying that retry is not (no longer?) recognized, and tries should be used.
