Bug#917607: udev 240 Makes System Unbootable; rootfs Not Found

[Martin]

I had the same issues on one of my computers and it behaved exactly as
described above: Nor root device found (USB keyboard unusable)
update-initramfs destroyed any initrd.img it touched with udev 240-2
a downgrade to 239-8 (the last I could get my hands on quickly)
resolved the issue 

The system is a Dell T5810 with a 6 core Xeon and an Intel 750 NVME

fstab:
# / was on /dev/nvme0n1p2 during installation
UUID=d70e9492-f746-4b89-b137-fa6d96af1430
/               ext4    errors=remount-ro 0       1

# /boot/efi was on /dev/nvme0n1p1 during installation
UUID=36E5-0424  /boot/efi       vfat    umask=0077      0       1
# UUID=6EDB-422E  /boot/efi       vfat    umask=0077      0       1

# /data was on /dev/sdc3 during installation
UUID=95266c1f-9843-4a91-b57c-47c2d27348be
/data           ext4    defaults        0       2

# /home was on /dev/nvme0n1p4 during installation
UUID=d6ead145-584c-49e5-a85b-182a55187f68
/home           ext4    defaults        0       2

# swap was on /dev/nvme0n1p3 during installation
UUID=7b37bd7c-f7d1-45eb-a228-07a7a77ae1e4
none            swap    sw              0       0

regards

Martin