[Bug 1794949] Re: update-alternatives inconsistent after package upgrade

[Julian Andres Klode]

It seems that you have created the alternative yourself, which is not
supported, and hence the bug is invalid. Please do not create
alternatives that don't exist.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to gcc-defaults in Ubuntu.
https://bugs.launchpad.net/bugs/1794949

Title:
  update-alternatives inconsistent after package upgrade

Status in gcc-defaults package in Ubuntu:
  Invalid

Bug description:
  $ gcc -v
  ...
  gcc version 8.1.0 (Ubuntu 8.1.0-1ubuntu1)
  $ sudo apt update && sudo apt upgrade
  ...
  The following packages will be upgraded:
    binutils binutils-common binutils-x86-64-linux-gnu cpp cpp-7 cpp-8 g++ g++-7
    g++-8 gcc gcc-7 gcc-7-base gcc-8 gcc-8-base gdm3 gir1.2-gdm-1.0 lib32gcc1
    lib32stdc++6 libasan4 libasan5 libatomic1 libbinutils libcc1-0 libcilkrts5
    libgcc-7-dev libgcc-8-dev libgcc1 libgdm1 libgomp1 libitm1 liblsan0 libmpx2
    libnautilus-extension1a libobjc-7-dev libobjc4 libquadmath0 libstdc++-7-dev
    libstdc++-8-dev libstdc++6 libtsan0 libubsan0 libubsan1 nautilus
    nautilus-data python3-distupgrade tzdata ubuntu-release-upgrader-core
    ubuntu-release-upgrader-gtk
  ...
  Setting up gcc-7 (7.3.0-27ubuntu1~18.04) ...
  Setting up g++-7 (7.3.0-27ubuntu1~18.04) ...
  Setting up gcc (4:7.3.0-3ubuntu2.1) ...
  Setting up gcc-8 (8.2.0-1ubuntu2~18.04) ...
  Setting up g++-8 (8.2.0-1ubuntu2~18.04) ...
  Setting up g++ (4:7.3.0-3ubuntu2.1) ...
  Processing triggers for libc-bin (2.27-3ubuntu1) ...
  $ gcc -v
  ...
  gcc version 7.3.0 (Ubuntu 7.3.0-27ubuntu1~18.04) 
  $ update-alternatives --display gcc
  gcc - auto mode
    link best version is /usr/bin/gcc-8
    link currently points to /usr/bin/gcc-8
    link gcc is /usr/bin/gcc
    slave g++ is /usr/bin/g++
  /usr/bin/gcc-7 - priority 700
    slave g++: /usr/bin/g++-7
  /usr/bin/gcc-8 - priority 800
    slave g++: /usr/bin/g++-8
  $ $ ll /usr/bin/gcc
  lrwxrwxrwx 1 root root 5 Sep 17 09:07 /usr/bin/gcc -> gcc-7*

  So after the upgrades update-alternatives shows that /usr/bin/gcc
  points to /usr/bin/gcc-8 as it was before the upgrades, when in fact
  it points to gcc-7.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gcc-defaults/+bug/1794949/+subscriptions