[Bug 1926858] [NEW] on azure upgraded from 16 to 18, now can not upgrade from 18 to 20

[osman d]

Public bug reported:

I have upgraded from 16 to 18 LTS on azure. While upgrading I did
change /boot/grub/menu.lst with the newer version and 
not change /etc/ssh/sshd_config but the port number with the custom one.
Used these commands after reboot: 
sudo su
apt update
apt upgrade
apt dist-upgrade
apt autoremove
apt autoclean
do-release-upgrade

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.44
ProcVersionSignature: Ubuntu 5.4.0-1046.48~18.04.1-azure 5.4.101
Uname: Linux 5.4.0-1046-azure x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
Date: Sat May  1 23:50:22 2021
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-05-01 (0 days ago)
VarLogDistupgradeLspcitxt:
 00:00.0 Host bridge [0600]: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (AGP disabled) [8086:7192] (rev 03)
 00:07.0 ISA bridge [0601]: Intel Corporation 82371AB/EB/MB PIIX4 ISA [8086:7110] (rev 01)
 00:07.1 IDE interface [0101]: Intel Corporation 82371AB/EB/MB PIIX4 IDE [8086:7111] (rev 01)
 00:07.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 02)
 00:08.0 VGA compatible controller [0300]: Microsoft Corporation Hyper-V virtual VGA [1414:5353]

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


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

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https://bugs.launchpad.net/bugs/1926858

Title:
  on azure upgraded from 16 to 18, now can not upgrade from 18 to 20

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

Bug description:
  I have upgraded from 16 to 18 LTS on azure. While upgrading I did
  change /boot/grub/menu.lst with the newer version and 
  not change /etc/ssh/sshd_config but the port number with the custom one.
  Used these commands after reboot: 
  sudo su
  apt update
  apt upgrade
  apt dist-upgrade
  apt autoremove
  apt autoclean
  do-release-upgrade

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 5.4.0-1046.48~18.04.1-azure 5.4.101
  Uname: Linux 5.4.0-1046-azure x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat May  1 23:50:22 2021
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-05-01 (0 days ago)
  VarLogDistupgradeLspcitxt:
   00:00.0 Host bridge [0600]: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (AGP disabled) [8086:7192] (rev 03)
   00:07.0 ISA bridge [0601]: Intel Corporation 82371AB/EB/MB PIIX4 ISA [8086:7110] (rev 01)
   00:07.1 IDE interface [0101]: Intel Corporation 82371AB/EB/MB PIIX4 IDE [8086:7111] (rev 01)
   00:07.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 02)
   00:08.0 VGA compatible controller [0300]: Microsoft Corporation Hyper-V virtual VGA [1414:5353]

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