Thank you for taking the time to file a bug report.
The mysql-server postinst script is failing because of this:
/var/lib/dpkg/info/mysql-server-8.0.postinst: line 191:
/usr/share/mysql-common/configure-symlinks: No such file or directory
The /usr/share/mysql-common/configure-symlinks file is provided by
mysql-common. Checking the list of package you have I found this:
mysql-client-8.0 8.0.26-0ubuntu0.20.04.2
mysql-client-core-8.0 8.0.26-0ubuntu0.20.04.2
mysql-common 8.0.13-1ubuntu16.04 [origin: unknown]
mysql-server-core-8.0 8.0.26-0ubuntu0.20.04.2
Your mysql-common package was not installed from the Ubuntu archive. In
a system running Ubuntu Focal you need the following:
$ dpkg -l | grep mysql
ii mysql-client-8.0 8.0.26-0ubuntu0.20.04.2 amd64
MySQL database client binaries
ii mysql-client-core-8.0 8.0.26-0ubuntu0.20.04.2 amd64
MySQL database core client binaries
ii mysql-common 5.8+1.0.5ubuntu2 all
MySQL database common files, e.g. /etc/mysql/my.cnf
ii mysql-server 8.0.26-0ubuntu0.20.04.2 all
MySQL database server (metapackage depending on the latest version)
ii mysql-server-8.0 8.0.26-0ubuntu0.20.04.2 amd64
MySQL database server binaries and system database setup
ii mysql-server-core-8.0 8.0.26-0ubuntu0.20.04.2 amd64
MySQL database server binaries
Note that you'll need to remove your mysql-common package manually
because its version is greater than the version in the Ubuntu archive
and apt will not override it. With the correct version of mysql-common
you should be able to install mysql-server.
Since it seems likely to me that this is a local configuration problem,
rather than a bug in Ubuntu, I am marking this bug as 'Incomplete'.
However, if you believe that this is really a bug in Ubuntu, then we would
be grateful if you would provide a more complete description of the problem
with steps to reproduce, explain why you believe this is a bug in Ubuntu
rather than a problem specific to your system, and then change the bug
status back to "New".
For local configuration issues, you can find assistance here:
http://www.ubuntu.com/support/community
** Changed in: mysql-8.0 (Ubuntu)
Status: New => Incomplete
** Summary changed:
- package mysql-server-8.0 8.0.26-0ubuntu0.20.04.2 failed to install/upgrade:
installed mysql-server-8.0 package post-installation script subprocess returned
error exit status 127
+ mysql-server postinst failure: /usr/share/mysql-common/configure-symlinks: No
such file or directory
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https://bugs.launchpad.net/bugs/1938599
Title:
mysql-server postinst failure: /usr/share/mysql-common/configure-
symlinks: No such file or directory
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