Hello and thanks for your bug report. This log excerpt suggest that you
installed or are trying to install an unofficial or modified mysql
package:

DuplicateSignature:
 package:mysql-server-8.0:8.0.25-0ubuntu0.20.04.1
 Setting up mysql-server-8.0 (8.0.25-0ubuntu0.20.04.1) ...
 /var/lib/dpkg/info/mysql-server-8.0.postinst: line 191: 
/usr/share/mysql-common/configure-symlinks: No such file or directory
 dpkg: error processing package mysql-server-8.0 (--configure):
  installed mysql-server-8.0 package post-installation script subprocess 
returned error exit status 127

This is a case we can't support, given that we don't have control on
such packages. My suggestion here is to cleanup all the 3rd party or
modified packages (`apt remove --purge` or `dpkg -P`) and try again.

I'm marking this bug report as Incomplete for the moment. If you agree
with my analysis please change its status to Invalid (= not a bug in
Ubuntu), otherwise please explain why you believe this is a bug in
Ubuntu rather a problem specific to your system, possibly providing
steps to reproduce, change the report status back to New and we'll look
at it again. Thanks!

** Changed in: mysql-8.0 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1933304

Title:
  package mysql-server-8.0 8.0.25-0ubuntu0.20.04.1 failed to
  install/upgrade: installed mysql-server-8.0 package post-installation
  script subprocess returned error exit status 127

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