[Bug 1795207] Re: upgrade to ubuntu-18.04: 'ubuntu-minimal' not found

[Pol Vangheluwe]

My architecture is "powerpc" (Apple G3 - G4 and G5 machines are big-endian machines).  Xenial supports both "powerpc" and "ppc64el" but Bionic only supports "ppc64el" (little-endian).  So, I am afraid that there is no solution for my problem: Xenial is the last Ubuntu release with support for "powerpc".
Of course, the release-upgrade app should be clearer about this:
- it should not propose an upgrade to a not-supported release;
- it should return a clearer error description when the upgrade fails.

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https://bugs.launchpad.net/bugs/1795207

Title:
  upgrade to ubuntu-18.04: 'ubuntu-minimal' not found

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

Bug description:
  I tried several times to upgrade to 18.04, but always get the same
  error: 'essential package ubuntu-minimal not found'.

  When I try to install ubuntu-minimal, then I get 'is already the
  newest version (1.361.1)' - translating from Dutch

  When I do a 'locate ubuntu-minimal' then I get this:
  /usr/share/doc/ubuntu-minimal
  /usr/share/doc/ubuntu-minimal/changelog.gz
  /usr/share/doc/ubuntu-minimal/copyright
  /var/lib/dpkg/info/ubuntu-minimal.list
  /var/lib/dpkg/info/ubuntu-minimal.md5sums

  So far, I never had a problem with an overloaded mirror-server, when
  doing upgrades or updates.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-135.161-powerpc64-smp 4.4.140
  Uname: Linux 4.4.0-135-powerpc64-smp ppc64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: powerpc
  CrashDB: ubuntu
  Date: Sun Sep 30 08:54:31 2018
  PackageArchitecture: all
  ProcEnviron:
   SHELL=/bin/bash
   PATH=(custom, no user)
   LANG=nl_BE.UTF-8
   LANGUAGE=nl_BE:nl
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-09-30 (0 days ago)

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