[Bug 1871885] [NEW] [qemu] Installed system fails to boot "ALERT! /dev/vda5 does not exist. Dropping to a shell!"

[Iain Lane]

Public bug reported:

Whenever I do a normal "Erase disk" install, I end up with an unbootable
system.

I get dropped to an initramfs prompt with the message "ALERT!  /dev/vda5
does not exist.  Dropping to a shell!"

But when I do "ls /dev/vda5", it is there... I tried adding
"rootdelay=30", but that just made the boot wait for 30 seconds longer
before failing in the same way.

In the attached logs, I was using the 20200409 image with Ubiquity
20.04.9.

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "screenshot of the failure"
   https://bugs.launchpad.net/bugs/1871885/+attachment/5350479/+files/argh.png

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https://bugs.launchpad.net/bugs/1871885

Title:
  [qemu] Installed system fails to boot "ALERT! /dev/vda5 does not
  exist.  Dropping to a shell!"

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Whenever I do a normal "Erase disk" install, I end up with an
  unbootable system.

  I get dropped to an initramfs prompt with the message "ALERT!
  /dev/vda5 does not exist.  Dropping to a shell!"

  But when I do "ls /dev/vda5", it is there... I tried adding
  "rootdelay=30", but that just made the boot wait for 30 seconds longer
  before failing in the same way.

  In the attached logs, I was using the 20200409 image with Ubiquity
  20.04.9.

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