Comment # 31 on bug 904987 from Dan Elder

I'm running into the exact same problem as everyone else on 42.2 with latest
updates applied using an NVMe.  I was able to restore a previous kernel/initrd
from offline backup (4.4.70-18.9-default) and get back into a usable system but
the latest updates never prompt for the password.  In case it helps at all:

delder:~ # cat /etc/crypttab
cr_nvme-200080d0200127f94-part4 /dev/disk/by-id/nvme-200080d0200127f94-part4
none       none
cr_ata-Samsung_SSD_850_EVO_2TB_S2HCNWAG702239M-part1
/dev/disk/by-id/ata-Samsung_SSD_850_EVO_2TB_S2HCNWAG702239M-part1 none      
none
cr_swap         /Slow/swap           none       noauto

delder:~ # lsinitrd -f etc/crypttab
cr_nvme-200080d0200127f94-part4 /dev/disk/by-id/nvme-200080d0200127f94-part4
none       none

delder:~ # /usr/lib/systemd/system-generators/systemd-cryptsetup-generator &&
ls /tmp/*.service
Failed to create unit file
/tmp/systemd-cryptsetup@cr_nvme\x2d200080d0200127f94\x2dpart4.service: File
exists
/tmp/systemd-cryptsetup@cr_ata\x2dSamsung_SSD_850_EVO_2TB_S2HCNWAG702239M\x2dpart1.service
 /tmp/systemd-cryptsetup@cr_swap.service
/tmp/systemd-cryptsetup@cr_nvme\x2d200080d0200127f94\x2dpart4.service