[Bug 1950921] [NEW] Following update, grub stuck in loop.

[Peter Mitchell]

Public bug reported:

Following a restart of Ubuntu server to finish updates, the computer is stuck at the grub boot screen. Selecting ubuntu to start unly returns the computer to the grub screen.
The computer is a virtual machine running on Hyper-V (windows server 16).
The computer starts correctly if the network card is disconnected during the first part of the boot process.
The same issue has occurred on both desktop and server VMs.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.30
ProcVersionSignature: Ubuntu 5.4.0-90.101-generic 5.4.148
Uname: Linux 5.4.0-90-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB: ubuntu
Date: Sun Nov 14 22:22:45 2021
InstallationDate: Installed on 2021-07-16 (121 days ago)
InstallationMedia: Ubuntu-Server 20.04.2 LTS "Focal Fossa" - Release amd64 (20210201.2)
PackageArchitecture: all
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal uec-images

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https://bugs.launchpad.net/bugs/1950921

Title:
  Following update, grub stuck in loop.

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Following a restart of Ubuntu server to finish updates, the computer is stuck at the grub boot screen. Selecting ubuntu to start unly returns the computer to the grub screen.
  The computer is a virtual machine running on Hyper-V (windows server 16).
  The computer starts correctly if the network card is disconnected during the first part of the boot process.
  The same issue has occurred on both desktop and server VMs.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.30
  ProcVersionSignature: Ubuntu 5.4.0-90.101-generic 5.4.148
  Uname: Linux 5.4.0-90-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.21
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  Date: Sun Nov 14 22:22:45 2021
  InstallationDate: Installed on 2021-07-16 (121 days ago)
  InstallationMedia: Ubuntu-Server 20.04.2 LTS "Focal Fossa" - Release amd64 (20210201.2)
  PackageArchitecture: all
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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