Public bug reported:

First note please that while Bionic https://packages.ubuntu.com/bionic-
updates/amd64/mysql-server-5.7/filelist packaged auth_socket.so Focal
does not do so. https://packages.ubuntu.com/focal/amd64/mysql-
server-8.0/filelist

Yet /var/lib/dpkg/info/mysql-server-8.0.postinst tries to install it and
even worse it uses despite it does not exist:

echo "ALTER USER 'root'@'localhost' IDENTIFIED WITH 'auth_socket';"
>> "$initfile"

After every MySQL upgrade I need to restart with --skip-grant-tables and
undo this because it becomes impossible to log in.

Also

    for d in $mysql_statedir $mysql_filesdir $mysql_keyringdir $mysql_logdir 
$mysql_rundir
    do
      if [ ! -d "$d" -a ! -L "$d" ]; then mkdir "$d"; fi
      chown -R mysql:mysql $d
      chmod 0700 $d
    done

This makes /var/run/mysqld 0700 which makes it impossible for non-root
users to access MySQL over the socket which is inside /var/run/mysqld

** Affects: mysql-8.0 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1972046

Title:
  mysql-server-8.0.postinst tries to install nonexistent plugin and sets
  the wrong permissions

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