Thank you for taking the time to file a bug report.
The mysql-server-8.0 package Pre-Depends on mysql-common package which
contains the missing script:
/var/lib/dpkg/info/mysql-server-8.0.postinst: line 191: /usr/share
/mysql-common/configure-symlinks: No such file or directory
Checking the dpkg and apt log files you provided I can't see any mention
to mysql-common, so for some reason it was not installed and the upgrade
failed. Could you please try to install mysql-common and then try to
upgrade mysql-server-8.0?
Since it seems likely to me that this is not 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".
** Changed in: mysql-8.0 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1881634
Title:
during the upgrade from 18.04 to 20.04 this happend: package mysql-
server-8.0 (not installed) failed to install/upgrade: installed mysql-
server-8.0 package post-installation script subprocess returned error
exit status 127
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