Bug#918322: initramfs-tools: kernel fails to boot with "Gave up waiting for root file system device"

[ludszuweit1]

 > Do you have a PS/2 keyboard? This should require any special (USB)
> kernel modules.

No, I don’t have a PS2 keyboard.

The following hint may be useful:

The computer of my wife with nearly the same software and update state as my one boots without problems with initrd image using udev 240-2.

Her computer uses
- ext4 with LVM and software raid
- conventional magnetic hard disc with ATA interface

My computer uses
- btrfs
- via m2 connected SSD.

Is it possible, that dev 240-2 have problems to boot with m2 connected SSDs?