Thanks for filing this bug in Ubuntu.
The mysql user is created by the mysql-server-5.7 package in its preinst
script. The logs you attached unfortunately don't contain the details
about what happened at that time, only that the user wasn't available
when the postinst script came along (the failed chown call).
Could you please try these commands, and paste their output here in the
bug:
sudo apt update
sudo apt install --reinstall mysql-server-5.7
sudo apt -f install
THanks
** Changed in: mysql-5.7 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1796569
Title:
package mysql-server-5.7 5.7.23-0ubuntu0.18.04.1 failed to
install/upgrade: installed mysql-server-5.7 package post-installation
script subprocess returned error exit status 1
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