Here are the steps to recreate the issue.
1. Use the following tutorial to install mysql 5.7 on ubuntu 20.04. Insert
some data into the database.
https://techexpert.tips/mysql/installing-mysql-5-7-ubuntu-20-04/
2. Uninstall mysql-client, mysql-community-server, and mysql-server.
apt-get remove mysql-community-server mysql-community-client mysql-server
mysql-common mysql-client
3. remove /etc/apt/preferences.d/mysql
4. install the default verson of mysql-server.
apt-get install mysql-server
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1914636
Title:
package mysql-server-8.0 8.0.23-0ubuntu0.20.04.1 failed to
install/upgrade: installed mysql-server-8.0 package post-installation
script subprocess returned error exit status 1
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mysql-8.0/+bug/1914636/+subscriptions
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