[Bug 1909753] [NEW] Can't update system when using mirror:// repo

[Dmitry Lapshin]

Public bug reported:

I use mirror://mirrors.ubuntu.com/mirrors.txt as Ubuntu package
repository on my laptop, since I used to (thanks to COVID) travel and
wanted to use fastest mirror whenever possible. It works great, however
do-release-upgrade/update-manager both fail with those: they report as
if ubuntu-minimal package is missing (and I've checked that isn't the
case in all mirrors chosen by mirror://). So for last 3 updates or so I
have to manually switch mirror:// repository to some regional http://
one, then update-manager does it's thing, then I switch back and
everything works as expected.

I think that behaviour of do-release-upgrade can be fixed.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.29
ProcVersionSignature: Ubuntu 5.4.0-58.64-generic 5.4.73
Uname: Linux 5.4.0-58-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
Date: Thu Dec 31 16:01:58 2020
InstallationDate: Installed on 2016-04-23 (1712 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
ProcEnviron:
 TERM=tmux-256color
 PATH=(custom, no user)
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2020-12-31 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2020-12-31 15:57:11.281233
 Log time: 2020-12-31 15:57:16.708208
 Log time: 2020-12-31 16:01:50.754834
 Log time: 2020-12-31 16:02:07.688083
VarLogDistupgradeTermlog:
 
modified.conffile..etc.update-manager.release-upgrades: [modified]
mtime.conffile..etc.update-manager.release-upgrades: 2020-12-31T14:36:38.501060

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal

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https://bugs.launchpad.net/bugs/1909753

Title:
  Can't update system when using mirror:// repo

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

Bug description:
  I use mirror://mirrors.ubuntu.com/mirrors.txt as Ubuntu package
  repository on my laptop, since I used to (thanks to COVID) travel and
  wanted to use fastest mirror whenever possible. It works great,
  however do-release-upgrade/update-manager both fail with those: they
  report as if ubuntu-minimal package is missing (and I've checked that
  isn't the case in all mirrors chosen by mirror://). So for last 3
  updates or so I have to manually switch mirror:// repository to some
  regional http:// one, then update-manager does it's thing, then I
  switch back and everything works as expected.

  I think that behaviour of do-release-upgrade can be fixed.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.29
  ProcVersionSignature: Ubuntu 5.4.0-58.64-generic 5.4.73
  Uname: Linux 5.4.0-58-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  Date: Thu Dec 31 16:01:58 2020
  InstallationDate: Installed on 2016-04-23 (1712 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=tmux-256color
   PATH=(custom, no user)
   LANG=ru_RU.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2020-12-31 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2020-12-31 15:57:11.281233
   Log time: 2020-12-31 15:57:16.708208
   Log time: 2020-12-31 16:01:50.754834
   Log time: 2020-12-31 16:02:07.688083
  VarLogDistupgradeTermlog:
   
  modified.conffile..etc.update-manager.release-upgrades: [modified]
  mtime.conffile..etc.update-manager.release-upgrades: 2020-12-31T14:36:38.501060

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