[Bug 1897799] Re: Essential package 'ubuntu-minimal' could not be located

[Brian Murray]

*** This bug is a duplicate of bug 1813354 ***
    https://bugs.launchpad.net/bugs/1813354

** This bug has been marked a duplicate of bug 1813354
   release-upgrader unable to deal with sources.list entries of "deb mirror://"

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https://bugs.launchpad.net/bugs/1897799

Title:
  Essential package 'ubuntu-minimal' could not be located

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

Bug description:
  While upgrading from bionic to focal fossa I get

  > Invalid package information
  >
  > 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.

  Just like [this user from
  Askubuntu](https://askubuntu.com/q/1231817/349837)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  Date: Tue Sep 29 17:38:17 2020
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-29 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2020-09-29 17:30:01.275265
   Log time: 2020-09-29 17:30:13.209067
   Log time: 2020-09-29 17:37:16.332964
   Log time: 2020-09-29 17:38:21.899194
  VarLogDistupgradeTermlog:

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