[Bug 2109882] [NEW] Cannot upgrade from oracular to plucky: No new release found

[jean-christophe manciot]

Public bug reported:

Upgrading the server from oracular 24.10 to plucky 25.04 fails because
do-release-upgrade wrongly believes the system is already upgraded to
plucky.

# uname -a
Linux server 6.11.0-25-generic #25-Ubuntu SMP PREEMPT_DYNAMIC Fri Apr 11 23:29:18 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

# cat /etc/update-manager/release-upgrades
# Default behavior for the release upgrader.

[DEFAULT]
# Default prompting and upgrade behavior, valid options:
#
#  never  - Never check for, or allow upgrading to, a new release.
#  normal - Check to see if a new release is available.  If more than one new
#           release is found, the release upgrader will attempt to upgrade to
#           the supported release that immediately succeeds the
#           currently-running release.
#  lts    - Check to see if a new LTS release is available.  The upgrader
#           will attempt to upgrade to the first LTS release available after
#           the currently-running one.  Note that if this option is used and
#           the currently-running release is not itself an LTS release the
#           upgrader will assume prompt was meant to be normal.
Prompt=normal

# lsb_release -a | grep "Codename" | awk -F ':' '{print $2}'
	oracular
# cat /usr/lib/os-release | grep "^UBUNTU_CODENAME" | sed -E "s|^UBUNTU_CODENAME=(.+)$|\1|g"
oracular
# apt-cache policy ubuntu-release-upgrader-core
ubuntu-release-upgrader-core:
  Installed: 1:24.10.14
  Candidate: 1:24.10.14
  Version table:
 *** 1:24.10.14 500
        500 https://fr.archive.ubuntu.com/ubuntu oracular-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:24.10.13 500
        500 https://fr.archive.ubuntu.com/ubuntu oracular/main amd64 Packages
# do-release-upgrade
Checking for a new Ubuntu release
No new release found.

What is going on?

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

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https://bugs.launchpad.net/bugs/2109882

Title:
  Cannot upgrade from oracular to plucky: No new release found

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

Bug description:
  Upgrading the server from oracular 24.10 to plucky 25.04 fails because
  do-release-upgrade wrongly believes the system is already upgraded to
  plucky.

  # uname -a
  Linux server 6.11.0-25-generic #25-Ubuntu SMP PREEMPT_DYNAMIC Fri Apr 11 23:29:18 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

  # cat /etc/update-manager/release-upgrades
  # Default behavior for the release upgrader.

  [DEFAULT]
  # Default prompting and upgrade behavior, valid options:
  #
  #  never  - Never check for, or allow upgrading to, a new release.
  #  normal - Check to see if a new release is available.  If more than one new
  #           release is found, the release upgrader will attempt to upgrade to
  #           the supported release that immediately succeeds the
  #           currently-running release.
  #  lts    - Check to see if a new LTS release is available.  The upgrader
  #           will attempt to upgrade to the first LTS release available after
  #           the currently-running one.  Note that if this option is used and
  #           the currently-running release is not itself an LTS release the
  #           upgrader will assume prompt was meant to be normal.
  Prompt=normal

  # lsb_release -a | grep "Codename" | awk -F ':' '{print $2}'
  	oracular
  # cat /usr/lib/os-release | grep "^UBUNTU_CODENAME" | sed -E "s|^UBUNTU_CODENAME=(.+)$|\1|g"
  oracular
  # apt-cache policy ubuntu-release-upgrader-core
  ubuntu-release-upgrader-core:
    Installed: 1:24.10.14
    Candidate: 1:24.10.14
    Version table:
   *** 1:24.10.14 500
          500 https://fr.archive.ubuntu.com/ubuntu oracular-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1:24.10.13 500
          500 https://fr.archive.ubuntu.com/ubuntu oracular/main amd64 Packages
  # do-release-upgrade
  Checking for a new Ubuntu release
  No new release found.

  What is going on?

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