grub rescue after installing alongside

[Ross Gammon]

Existing Ubuntu Studio installation (21.10) is on sda.
Plugged in external USB disk (500G) - sdc. Wiped partition on it with gparted.
Booted into 20.04.4 Ubuntu Studio Live DVD & chose install. Chose to install alongside 21.10, and it correctly installed to sdc.
On reboot, I got the grub rescue prompt.
I had to boot back into the Live DVD, chroot into sda, reinstall grub, and upgrade grub.
After a reboot, I can now boot both installations.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
DistroRelease: Ubuntu 20.04
InstallCmdLine: file=/cdrom/preseed/ubuntustudio.seed only-ubiquity initrd=/casper/initrd quiet splash --- debian-installer/language=da keyboard-configuration/layoutcode?=dk
InstallationDate: Installed on 2022-02-21 (0 days ago)
InstallationMedia: Ubuntu-Studio 20.04.4 LTS "Focal Fossa" - Release amd64 (20220218)
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 5.13.0-30.33~20.04.1-lowlatency 5.13.19
Tags: focal ubiquity-20.04.15.19
Uname: Linux 5.13.0-30-lowlatency x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True

[Erich Eickmeyer (eeickmeyer)]

Hi Ross, I hate to do this but I have to go with the copy/paste message since you've got a ton of info missing for the team:

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1961626

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1961626

[Ross Gammon (rosco2)]

apport information

[Ross Gammon (rosco2)]

apport information

[Ross Gammon (rosco2)]

apport information

[Ross Gammon (rosco2)]

apport information

[Ross Gammon (rosco2)]

apport information

[Ross Gammon (rosco2)]

No problems Erich. It is a bit hard to do that when you can't boot in to the machine and it makes you late for your evening meal :-)

[Erich Eickmeyer (eeickmeyer)]

I wonder if this might be related to LP: #1955109?

[Ross Gammon (rosco2)]

Bit hard to tell. But it has recently been fixed, so I could try and break my machine again with a new spin of the ISO tomorrow.

[Erich Eickmeyer (eeickmeyer)]

Just tried this in a VM and could not reproduce. So far, my smoke tests of Ubuntu Studio 20.04.4 have been rock-solid.