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

[Damian Icely]

Still affecting me upgrating from 18.04 LTS to 20.04 LTS

After updating your package information, the essential package 
'ubuntu-minimal' could not be located. This may be because you have 
no official mirrors listed in your software sources, or because of 
excessive load on the mirror you are using. See /etc/apt/sources.list 
for the current list of configured software sources. 
In the case of an overloaded mirror, you may want to try the upgrade 
again later. 

``` 
Restoring original system state

Aborting
      g package lists... 4%[[B
*** Collecting problem information

The collected information can be sent to the developers to improve the
application. This might take a few minutes.
Reading package lists... Done    
Building dependency tree          
Reading state information... Done
```

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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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