Hello Duvan and thanks for this bug report. The failure is:

  /var/lib/dpkg/info/mysql-server-8.0.postinst: line 47: kill: (18631) -
Permission denied

By looking at the postinst script that line is just:

  kill "$server_pid"

and as that script runs as root I'm surprised by the error. However your
kernel has error lines like:

[ 7434.479844] audit: type=1400 audit(1603310184.859:52):
apparmor="DENIED" operation="signal" profile="/usr/sbin/mysqld" pid=7749
comm="kill" requested_mask="receive" denied_mask="receive" signal=term
peer="snap.code.code"

so (1) the kill is prevented by apparmor (2) that peer="snap.code.code"
makes me think that you're running apt from VSCode's built-in terminal.
As VSCode is a snap (code), snap confinement and other safety features
are in place, and that's likely what prevents the kill command to
succeed.

Were you actually running the command from VSCode's terminal?
Does the install/upgrade command work if you use Ubuntu's default terminal?

Waiting for your reply I'm marking this bug report as Incomplete. Please
change it back to New after commenting back and we'll look at it again.
Thanks!

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https://bugs.launchpad.net/bugs/1900913

Title:
  package mysql-server-8.0 8.0.21-0ubuntu0.20.04.4 failed to
  install/upgrade: installed mysql-server-8.0 package post-installation
  script subprocess returned error exit status 1

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