Thank you for taking the time to file a bug report.
In your dmesg output you can see the following:
[5284027.672979] audit: type=1107 audit(1626087263.974:189): pid=748 uid=103
auid=4294967295 ses=4294967295 msg='apparmor="DENIED"
operation="dbus_method_call" bus="system" path="/org/freedesktop/systemd1"
interface="org.freedesktop.systemd1.Manager" member="GetDynamicUsers"
mask="send" name="org.freedesktop.systemd1" pid=3211 label="/usr/sbin/mysqld"
peer_pid=1 peer_label="unconfined"
exe="/usr/bin/dbus-daemon" sauid=103 hostname=? addr=?
terminal=?'
mysqld process is trying to do something and its apparmor profile is not
allowing it. In your local modifications in the config file you will
notice that you changed the path of log_bin to
/nas/nextclouddata/mysqlbinlog/v2/binlog.log . If you check the mysqld
apparmor profile (/etc/apparmor.d/usr.sbin.mysqld) you will see that
there is no permission to access your directory, that is the reason why
it get denied by apparmor. To fix you problem you should do some
customization in the apparmor profile to let mysqld have access to the
directory you want to use.
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
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https://bugs.launchpad.net/bugs/1935836
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 1
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