I am experiencing this as well on a fresh install of 24.04 to a blank
NVMe using the ZFS with encryption option. I see similar error messages
under the password dialog when unlocking the disk. As far as I can tell
things seem to work fine.
update-initramfs: Generating /boot/initrd.img-6.8.0-31-generic
cryptsetup: WARNING: dm_crypt-0: couldn't determine device type, assuming
default (plain).
cryptsetup: WARNING: Option 'cipher' missing in crypttab for plain dm-crypt
mapping dm_crypt-0. Please read
/usr/share/doc/cryptsetup-initramfs/README.initramfs.gz and add the correct
'cipher' option to your crypttab(5).
cryptsetup: WARNING: Option 'size' missing in crypttab for plain dm-crypt
mapping dm_crypt-0. Please read
/usr/share/doc/cryptsetup-initramfs/README.initramfs.gz and add the correct
'size' option to your crypttab(5).
cryptsetup: WARNING: Resume target dm_crypt-0 uses a key file
Ubuntu 24.04 LTS \n \l
Linux 6.8.0-31-generic #31-Ubuntu SMP PREEMPT_DYNAMIC Sat Apr 20
00:40:06 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 4K 1 loop /snap/bare/5
loop1 7:1 0 74.2M 1 loop /snap/core22/1380
loop2 7:2 0 269.6M 1 loop /snap/firefox/4173
loop3 7:3 0 10.7M 1 loop /snap/firmware-updater/127
loop4 7:4 0 505.1M 1 loop /snap/gnome-42-2204/176
loop5 7:5 0 91.7M 1 loop /snap/gtk-common-themes/1535
loop6 7:6 0 10.3M 1 loop /snap/snap-store/1124
loop7 7:7 0 38.7M 1 loop /snap/snapd/21465
loop8 7:8 0 476K 1 loop /snap/snapd-desktop-integration/157
zd0 230:0 0 20M 0 disk
└─keystore-rpool 252:0 0 4M 0 crypt /run/keystore/rpool
nvme0n1 259:0 0 931.5G 0 disk
├─nvme0n1p1 259:1 0 1G 0 part /boot/efi
├─nvme0n1p2 259:2 0 2G 0 part
├─nvme0n1p3 259:3 0 8G 0 part
│ └─dm_crypt-0 252:1 0 8G 0 crypt [SWAP]
└─nvme0n1p4 259:4 0 920.5G 0 part
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https://bugs.launchpad.net/bugs/2060947
Title:
Warnings produced in apt upgrade processing triggers for initramfs-
tools
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