[Bug 1595138] Re: package g++ 4:5.3.1-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

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** Tags removed: need-duplicate-check

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Title:
  package g++ 4:5.3.1-1ubuntu1 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 2

Status in gcc-defaults package in Ubuntu:
  New

Bug description:
  I have had installed the latest version of gcc (gcc-6 and g++-6) from ppa:ubuntu-toolchaint-r/test.
  It was running as beautifully and smoothly as possible. But I think after a automatic system update on Ubuntu Software, it has a problem and my IDE (Code::Blocks) couldn't find the binary file for g++ or gcc.

  I tried the command:

  ls -l cpp* gcc* g++*

  as root in the /usr/bin directory but no such file exist which is
  contrary to what

  locate gcc

  command reports.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: g++ 4:5.3.1-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
  Uname: Linux 4.4.0-24-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Date: Wed Jun 22 15:01:52 2016
  DuplicateSignature:
   package:g++:4:5.3.1-1ubuntu1
   Setting up g++ (4:5.3.1-1ubuntu1) ...
   update-alternatives: error: alternative path /usr/bin/g++ doesn't exist
   dpkg: error processing package g++ (--configure):
    subprocess installed post-installation script returned error exit status 2
  ErrorMessage: subprocess installed post-installation script returned error exit status 2
  InstallationDate: Installed on 2016-06-11 (11 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.10ubuntu1
  SourcePackage: gcc-defaults
  Title: package g++ 4:5.3.1-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
  UpgradeStatus: No upgrade log present (probably fresh install)

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