[Bug 1875351] Re: Upgrade to 20.04 fails due to inability to resolve archive.ubuntu.com

[Brian Murray]

There was an error contacting the mirror of the Ubuntu archive which you
use due to a name resolution failure. Please ensure that you can resolve
archive.ubuntu.com and try the upgrade again.

2020-04-27 12:40:40,036 DEBUG url_downloadable: http://archive.ubuntu.com/ubuntu/dists/focal/Release
2020-04-27 12:40:40,036 DEBUG s='http' n='archive.ubuntu.com' p='/ubuntu/dists/focal/Release' q='' f=''
2020-04-27 12:41:05,085 DEBUG error from httplib: '<urlopen error [Errno -3] Temporary failure in name resolution>'

** Summary changed:

- Upgrade to 20.04 fails
+ Upgrade to 20.04 fails due to inability to resolve archive.ubuntu.com

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1875351

Title:
  Upgrade to 20.04 fails due to inability to resolve archive.ubuntu.com

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

Bug description:
  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  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. 

  
  Restoring original system state

  Aborting
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubuntu-release-upgrader-core 1:19.10.15.4
  ProcVersionSignature: Ubuntu 5.3.0-46.38-generic 5.3.18
  Uname: Linux 5.3.0-46-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.8
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Apr 27 14:12:23 2020
  InstallationDate: Installed on 2018-12-13 (501 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to eoan on 2020-04-27 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2020-04-27 12:40:15.852774
   Log time: 2020-04-27 12:40:30.189388
   Log time: 2020-04-27 14:12:22.668365
   Log time: 2020-04-27 14:12:25.440373

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