[Bug 1923865] Re: Bootable buildd xenial images go to initramfs on boot

[Gauthier Jolly]

Hi,

Checking the cmdline, the root filesystem is not set:

/boot/vmlinuz-4.4.0-21-generic root= ro  quiet splash $vt_handoff

If I change it to "root=PARTUUID=fb561bdb-b68a-44ae-a884-a5fd70f80cf7"
it's booting.

I see also two other errors during boot:

[    0.075065] core perfctr but no constraints; unknown hardware!
fsck: error 2 (No such file or directory) while executing fsck.ext4 for /dev/vda1
fsck exited with status code 8

The fsk issue is also present in the bionic images I tried but not the
perfctr one.

I just think something went/was wrong when grub was updated during
build.

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https://bugs.launchpad.net/bugs/1923865

Title:
  Bootable buildd xenial images go to initramfs on boot

Status in cloud-images:
  Confirmed
Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  This image:

  http://cloud-
  images.ubuntu.com/daily/server/buildd/daily/xenial/current/xenial-
  server-cloudimg-amd64-disk.img

  Fails to boot, with either UEFI or MBR:

  ```
  error: can't find command `hwmatch'.
  error: no such device: root.
  ```

  Then it goes straight into initramfs.

  Every once in a while there's more context written:

  ```
  mount: can't find /root in /etc/fstab
  mount: mounting /dev on /root/dev failed: No such file or directory
  mount: mounting /run on /root/run failed: No such file or directory
  run-init: current directory on the same filesystem as the root: error 0
  Target filesstem doesn't have requested /sbin/init.
  run-init: current directory on the same filesystem as the root: error 0
  ...
  No init found. Try passing init= bootarg.
  ```

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