[Bug 1920753] Re: Cannot install build-essential on fresh Ubuntu 20.04.2 installation

[Olivier Gayot]

I just tried an install of 20.04.5 in a VM after selecting:
* Minimal installation
* Download updates while installing.
* Erase disk and install Ubuntu

Sadly, I did not reproduce the issue. After reboot, I was able to
install build-essential and my source.list contains the -updates pocket
as expected.

$ grep -v '^#' sources.list | awk NF

deb http://fr.archive.ubuntu.com/ubuntu/ focal main restricted
deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates main restricted
deb http://fr.archive.ubuntu.com/ubuntu/ focal universe
deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates universe
deb http://fr.archive.ubuntu.com/ubuntu/ focal multiverse
deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates multiverse
deb http://fr.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu focal-security main restricted
deb http://security.ubuntu.com/ubuntu focal-security universe
deb http://security.ubuntu.com/ubuntu focal-security multiverse

Full source list content: https://pastebin.canonical.com/p/Bs945Z8FQV/

@uusijani, would you mind sharing the output of /var/log/installer from
your broken installation? There might be information in this file that
you could consider confidential, so please make sure to redact anything
sensitive.

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https://bugs.launchpad.net/bugs/1920753

Title:
  Cannot install build-essential on fresh Ubuntu 20.04.2 installation

Status in build-essential package in Ubuntu:
  New

Bug description:
  After a fresh install of Ubuntu 20.04.2 (followed by upgrade to the
  very latest packages) I installed gcc and then wanted to install
  build-essential, but it fails with the following error message:

  $ sudo apt install build-essential
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies.
   build-essential : Depends: libc6-dev but it is not going to be installed or
                              libc-dev
                     Depends: g++ (>= 4:9.2) but it is not going to be installed
  E: Unable to correct problems, you have held broken packages.

  This means that nothing can be compiled, obviously.

  Also, g++ cannot be installed either:

  $ sudo apt install g++
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies.
   g++ : Depends: g++-9 (>= 9.3.0-3~) but it is not going to be installed
  E: Unable to correct problems, you have held broken packages.
  $ gcc --version
  gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
  Copyright (C) 2019 Free Software Foundation, Inc.
  This is free software; see the source for copying conditions.  There is NO
  warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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