Hmm thanks!
OK, so I don't have a /dev/root either; what seems to happen (see 
/usr/share/initramfs-tools/hook-functions) is that it
checks the output of

mount

to see where / is mounted, and it's finding that it says /dev/root - and
so that's what it uses /dev/disk/by-uuid to look at via blkid to see
where it really goes; if mount is saying /dev/root then mkinitramfs is
expecting there to be a /dev/root, and looking at the attched

df

output:

rootfs          36612928  22853144  11924828  66% /
/dev/root       36612928  22853144  11924828  66% /

It's obvious something is a bit weird.

So, time for some more questions:
   * What does   cat /proc/cmdline    show
   * Does this machine have any odd boot process?
   * Is there anything else odd you've seen, I see:

[    4.743386] init: Failed to create pty - disabling logging for job
[    4.743486] init: Temporary process spawn error: No such file or directory

in the logs - that's a bit odd.


** Changed in: initramfs-tools (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1062699

Title:
  package linux-image-3.2.0-31-generic 3.2.0-31.50 failed to
  install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools
  exited with return code 1 [/dev/disk/by-uuid: Is a directory ,
  mkinitramfs: for root /dev/disk/by-uuid missing disk/by-uuid
  /sys/block/ entry]

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