Public bug reported:
I believe I have discovered problems in the *recent builds* of Ubuntu
14.04 and 16.04 (NO ISSUE with 18.04 or OLDER 14.04/16.04 builds) cloud
images (https://cloud-images.ubuntu.com/) for instances with very large
local disks. We are using OpenStack Queens on Ubuntu 16.04 and have
noticed that when our users deploy our largest instance type with ~5TB
local disk that the VM deploys but when that VM is rebooted for the
first time it wont boot and becomes stuck at the 'grub rescue' prompt
with 'error: unknown filesystem.'.
I believe the issue is happening in the growpart function of cloud-init
of the first boot of the VM to grow the root partition to fit the large
local disk. I have attached as much logging and output information from
14.04, 16.04 and 18.04 but I do not have a developer background so I
can't pinpoint the issue entirely.
I am able to easily reproduce this issue and would happy to help with
the resolution of this bug in any capacity.
Thank you!
** Affects: cloud-init (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "ubuntu-logs-screenshot.zip"
https://bugs.launchpad.net/bugs/1812411/+attachment/5230331/+files/ubuntu-logs-screenshot.zip
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https://bugs.launchpad.net/bugs/1812411
Title:
cloud-init corrupting grub
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