[Bug 1926873] [NEW] Invalid Package Information during upgrade to 21.04

[Puneet Khurana]

Public bug reported:

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. 


Then, when I tried to install ubuntu-minimal in another terminal window, it says that ubuntu minimal is already the newest version

Reading package lists... Done
Building dependency tree       
Reading state information... Done
ubuntu-minimal is already the newest version (1.459).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubuntu-release-upgrader-core 1:20.10.15
ProcVersionSignature: Ubuntu 5.8.0-51.57-generic 5.8.18
Uname: Linux 5.8.0-51-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.6
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
Date: Sun May  2 14:30:38 2021
InstallationDate: Installed on 2020-08-14 (260 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_IN:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to groovy on 2021-05-02 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2021-05-02 14:30:02.877291
 Log time: 2021-05-02 14:30:12.758567
 Log time: 2021-05-02 14:30:35.442442
 Log time: 2021-05-02 14:30:38.049853

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


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

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https://bugs.launchpad.net/bugs/1926873

Title:
  Invalid Package Information during upgrade to 21.04

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

Bug description:
  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. 

  
  Then, when I tried to install ubuntu-minimal in another terminal window, it says that ubuntu minimal is already the newest version

  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  ubuntu-minimal is already the newest version (1.459).
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: ubuntu-release-upgrader-core 1:20.10.15
  ProcVersionSignature: Ubuntu 5.8.0-51.57-generic 5.8.18
  Uname: Linux 5.8.0-51-generic x86_64
  ApportVersion: 2.20.11-0ubuntu50.6
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  Date: Sun May  2 14:30:38 2021
  InstallationDate: Installed on 2020-08-14 (260 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_IN:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_IN
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to groovy on 2021-05-02 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2021-05-02 14:30:02.877291
   Log time: 2021-05-02 14:30:12.758567
   Log time: 2021-05-02 14:30:35.442442
   Log time: 2021-05-02 14:30:38.049853

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