[Bug 1578823] [NEW] Impossible to upgrade from 12.04 LTS to 14.04 LTS

[AlainKnaff]

Public bug reported:

Just tried to upgrade a 12.04 installation to 14.04 using do-release-
upgrade

do-release-upgrade just says "No new release found"

According to https://wiki.ubuntu.com/Releases, 12.04 is still supposed
to be supported until April 2017, so don't tell me I'm way too late to
upgrade.

root at lll:~# lsb_release -rd
Description:    Ubuntu 12.04.5 LTS
Release:        12.04
root at lll:~# apt-cache policy  update-manager-core
update-manager-core:
  Installed: 1:0.156.14.19
  Candidate: 1:0.156.14.19
  Version table:
 *** 1:0.156.14.19 0
        500 http://be.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:0.156.14.5 0
        500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
     1:0.156.14 0
        500 http://be.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

What you expected to happen:
- Until April 2017 (at least), it should still be possible to upgrade from 12.04 to 14.04

What happened instead
- do-release-upgrade tells me No new release found

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1578823

Title:
  Impossible to upgrade from 12.04 LTS to 14.04 LTS

Status in update-manager package in Ubuntu:
  New

Bug description:
  Just tried to upgrade a 12.04 installation to 14.04 using do-release-
  upgrade

  do-release-upgrade just says "No new release found"

  According to https://wiki.ubuntu.com/Releases, 12.04 is still supposed
  to be supported until April 2017, so don't tell me I'm way too late to
  upgrade.

  root at lll:~# lsb_release -rd
  Description:    Ubuntu 12.04.5 LTS
  Release:        12.04
  root at lll:~# apt-cache policy  update-manager-core
  update-manager-core:
    Installed: 1:0.156.14.19
    Candidate: 1:0.156.14.19
    Version table:
   *** 1:0.156.14.19 0
          500 http://be.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1:0.156.14.5 0
          500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
       1:0.156.14 0
          500 http://be.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

  What you expected to happen:
  - Until April 2017 (at least), it should still be possible to upgrade from 12.04 to 14.04

  What happened instead
  - do-release-upgrade tells me No new release found

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