[Bug 1849918] Re: Release upgrade disco->eoan fails when Ubuntu mirrors are specified in mirrors:// format

[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/1849918

Title:
  Release upgrade disco->eoan fails when Ubuntu mirrors are specified in
  mirrors:// format

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

Bug description:
  When updating Ubuntu 19.04 (disco) to 19.10 (eoan), ubuntu-release-
  upgrader throws the following error about missing package information
  and a missing ubuntu-minimal-package (in German):

  ```
  Ungültige Paketinformationen

  Das benötigte Paket »ubuntu-minimal« wurde nach der Aktualisierung
  Ihrer Paketinformationen nicht gefunden. Dies kann daran liegen, dass
  Sie keine offiziellen Spiegel-Server in Ihren Paketquellen
  eingetragen haben oder ein Spiegel-Server überlastet ist.
  Ihre derzeit eingerichteten Paketquellen finden Sie in
  /etc/apt/sources.list. Im Falle eines überlasteten Spiegel-Servers
  können Sie es später erneut versuchen.
  ```

  In my `/etc/apt/sources.list`, the Ubuntu mirrors are specified
  through `mirrors.txt` and `mirrors://` URLs, as in

  ```
  deb mirror://mirrors.ubuntu.com/mirrors.txt/ disco main restricted
  ...
  ```

  When I change that manually to a regular HTTP URL for some fixed
  mirror (e.g. `deb http://de.archive.ubuntu.com/ubuntu/ disco main
  restricted`), it works and the upgrade process proceeds normally.

  It looks like ubuntu-release-upgrader does not recognize the
  `mirrors://` URL format when the package sources from disco to eoan.
  As a result during the upgrade process the sources list ends up almost
  empty (only InRelease packages), and consequently the ubuntu-minimal
  package is not found.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: ubuntu-release-upgrader-core 1:19.04.16.7
  ProcVersionSignature: Ubuntu 5.0.0-31.33-generic 5.0.21
  Uname: Linux 5.0.0-31-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27.1
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Oct 26 10:52:49 2019
  InstallationDate: Installed on 2018-12-26 (304 days ago)
  InstallationMedia: Kubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to disco on 2019-10-26 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2019-10-26 10:52:28.812605
   Log time: 2019-10-26 10:52:35.715386
   Log time: 2019-10-26 10:52:49.543592
   Log time: 2019-10-26 10:52:51.766789

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