[Bug 1875855] [NEW] I am unable to upgrade 18.04 to 20.04

[Hel Bahadur Thapa]

Public bug reported:

It is failed at preparing for upgrade phase.

Some third party entries in your sources.list were disabled. You can re-
enable them after the upgrade with the 'software-properties' tool or
your package manager.


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.

Thanx & regards
HEl

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
Uname: Linux 5.3.0-51-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
Date: Wed Apr 29 13:04:05 2020
InstallationDate: Installed on 2020-01-03 (117 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-04-29 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2020-04-29 13:03:25.125378
 Log time: 2020-04-29 13:03:39.459447
 Log time: 2020-04-29 13:04:03.059866
 Log time: 2020-04-29 13:04:11.263255
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1875855

Title:
  I am unable to upgrade 18.04 to 20.04

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

Bug description:
  It is failed at preparing for upgrade phase.

  Some third party entries in your sources.list were disabled. You can
  re-enable them after the upgrade with the 'software-properties' tool
  or your package manager.


  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.

  Thanx & regards
  HEl

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
  Uname: Linux 5.3.0-51-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  CrashDB: ubuntu
  Date: Wed Apr 29 13:04:05 2020
  InstallationDate: Installed on 2020-01-03 (117 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-04-29 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2020-04-29 13:03:25.125378
   Log time: 2020-04-29 13:03:39.459447
   Log time: 2020-04-29 13:04:03.059866
   Log time: 2020-04-29 13:04:11.263255
  VarLogDistupgradeTermlog:

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