Over 3 months with no response. We are closing this bug report because
it lacks the information we need to investigate the problem, as
described in the previous comments. Please reopen it if you can give us
the missing information, and don't hesitate to submit bug reports in the
future. To reopen
Try using the -v flag with update-initramfs. This will cause everything
that is being done to be written to the console output.
** Changed in: initramfs-tools (Ubuntu)
Status: New => Incomplete
--
update-initramfs doesn't pass in the ROOT info to mkinitramfs
https://bugs.launchpad.net/bug