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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1812411 Title: cloud-init corrupting grub To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1812411/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs