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

[Simon Chopin]

@Jani: on the affected system, could you give us the output of `apt
policy libc6-dev` and apt policy libc6` ?

My guess would be that it's due to phased updates, but I don't get why
2.31_0ubuntu9.7 would still be held back?

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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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