MySQL (Community) server upgrade 5.7 to 8.0 failed, packages have unmet dependencies

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On a Ubuntu 20.04 (Focal) system, MySQL should be upgraded from 5.7 to 8.0, using the MySQL community packages from the MySQL repositories.

Note: Read here how to install a MySQL Community Server 5.7 on Ubuntu 20.04.

But a "simple" task turned out to be a weird head-scratcher.

Configure MySQL community repositories in APT

Oracle has prepared a deb package to configure the MySQL community repositories on Debian and Ubuntu systems. The package not only contains the correct APT sources configuration but also the needed GPG public key.

So let's download and install the mysql-apt-config package:

root@mysqlserver:~# wget
root@mysqlserver:~# dpkg -i mysql-apt-config_0.8.28-1_all.deb
(Reading database ... 111489 files and directories currently installed.)
Preparing to unpack mysql-apt-config_0.8.28-1_all.deb ...
Unpacking mysql-apt-config (0.8.28-1) over (0.8.24-1) ...
Setting up mysql-apt-config (0.8.28-1) ...

In a ncurses menu, the wanted MySQL server and version can be chosen. With current mysql-apt-config packages, the only choice should be version 8.0. Once MySQL Community Server 8.0 was chosen and confirmed with "Ok", the ncurses dialog disappears again and the package installation and configuration is completed.

Upgrade / Install MySQL Community Server 8.0

Time to do the upgrade by installing the MySQL community packages:

root@mysqlserver:~# apt-get install mysql-community-server mysql-community-client
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 mysql-community-client : Depends: libc6 (>= 2.34) but 2.31-0ubuntu9.12 is to be installed
                          Depends: libssl3 (>= 3.0.0) but it is not installable
                          Depends: libstdc++6 (>= 11) but 10.5.0-1ubuntu1~20.04 is to be installed
                          Depends: mysql-community-client-core (= 8.0.35-1ubuntu23.04) but it is not going to be installed
 mysql-community-server : Depends: mysql-community-server-core (= 8.0.35-1ubuntu23.04) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

What now? Why wouldn't this work? A dependency on libc6 in version 2.34? Comparing this with the currently installed version:

root@mysqlserver:~# dpkg -l|grep libc6
ii  libc6:amd64    2.31-0ubuntu9.12     amd64        GNU C Library: Shared libraries

Why would a package for focal require a newer version?

Wrong Ubuntu version configured as APT source

And this question led me to verify the actual APT source definition of the MySQL repositories:

root@mysqlserver:~# cat /etc/apt/sources.list.d/mysql.list
# You may comment out entries below, but any other modifications may be lost.
# Use command 'dpkg-reconfigure mysql-apt-config' as root for modifications.
deb [signed-by=/usr/share/keyrings/mysql-apt-config.gpg] lunar mysql-apt-config
deb [signed-by=/usr/share/keyrings/mysql-apt-config.gpg] lunar mysql-8.0
deb [signed-by=/usr/share/keyrings/mysql-apt-config.gpg] lunar mysql-tools
#deb [signed-by=/usr/share/keyrings/mysql-apt-config.gpg] lunar mysql-tools-preview
deb-src [signed-by=/usr/share/keyrings/mysql-apt-config.gpg] lunar mysql-8.0

What the... ?! The MySQL repositories were all configured with the "lunar" distribution release, instead of focal, what this machine is using.

Maybe the lunar release somehow got hard-coded into the mysql-apt-config package?

After replacing the wrongly configured "lunar" entries with "focal", the installation and therefore MySQL upgrade worked:

root@mysqlserver:~# sed -i "s/lunar/focal/g" /etc/apt/sources.list.d/mysql.list
root@mysqlserver:~# apt-get update
root@mysqlserver:~# apt-get dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
  mecab-ipadic mecab-ipadic-utf8 mecab-utils mysql-community-client-core
  mysql-community-client-plugins mysql-community-server-core
The following packages will be upgraded:
  libmysqlclient21 mysql-client mysql-community-client mysql-community-server mysql-server

5 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 44.1 MB of archives.
After this operation, 37.8 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y

MySQL community server 8.0 was running smoothly after this.

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