Ok, here is all the information you requested:
$ dpkg -l gcc
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-================-============-=================================
ii gcc 4:9.3.0-1ubuntu2 amd64 GNU C compiler
$ 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.
$ apt policy g++
g++:
Installed: (none)
Candidate: 4:9.3.0-1ubuntu2
Version table:
4:9.3.0-1ubuntu2 500
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
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https://bugs.launchpad.net/bugs/1920753
Title:
Cannot install build-essential on fresh Ubuntu 20.04.2 installation
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