Package: cryptsetup Version: 2:2.8.3-1 sfdisk displays the following for a swap partition:
------------------------------------------------------------ root@debian:/home/user# sfdisk --part-uuid /dev/sdb 9 AB20A9BE-D613-4F24-A7DA-FBCEC20FC644 ------------------------------------------------------------ So this entry in /etc/crypttab should work: ------------------------------------------------------------ myswap PARTUUID=AB20A9BE-D613-4F24-A7DA-FBCEC20FC644 /dev/urandom swap,plain,cipher=aes-xts-plain64,size=256 ------------------------------------------------------------ But it doesn't work: ------------------------------------------------------------ root@debian:/home/user# cryptdisks_start myswap Starting crypto disk...myswap (skipped, device PARTUUID=AB20A9BE-D613-4F24-A7DA-FBCEC20FC644 does not exist)...failed ------------------------------------------------------------ Puzzlement ensues... The answer is that cryptdisks_start is case-sensitive to PARTUUID, and hex digits must be written in lower case. This entry... ------------------------------------------------------------ myswap PARTUUID=ab20a9be-d613-4f24-a7da-fbcec20fc644 /dev/urandom swap,plain,cipher=aes-xts-plain64,size=256 ------------------------------------------------------------- ... does work: ------------------------------------------------------------- root@debian:/home/user# cryptdisks_start myswap Starting crypto disk...myswap (starting)...myswap (started)...done. ------------------------------------------------------------- I'm using a live boot of sid: ------------------------------------------------------------- root@debian:/home/user# cat /etc/os-release PRETTY_NAME="Debian GNU/Linux forky/sid" NAME="Debian GNU/Linux" VERSION_CODENAME=forky ID=debian HOME_URL="https://www.debian.org/"; SUPPORT_URL="https://www.debian.org/support"; BUG_REPORT_URL="https://bugs.debian.org/"; IMAGE_ID=live BUILD_ID=20251229T080959Z ------------------------------------------------------------- The problem also occurs with earlier releases of cryptsetup (I originally encountered the problem on Kubuntu 25.04). Incidentally, sgdisk (not available on the live boot) also outputs the partition UUID with upper-case hex digits: ------------------------------------------------------------- # sgdisk --info=9 /dev/sdh Partition GUID code: 0657FD6D-A4AB-43C4-84E5-0933C84B4F4F (Linux swap) Partition unique GUID: AB20A9BE-D613-4F24-A7DA-FBCEC20FC644 ... ... ------------------------------------------------------------- /dev/disk/by-partuuid lists lower-case digits, however.
