Yeah it fails to (re)start in your case.
>From your mysql log:
2018-02-10T17:30:08.421243Z 0 [ERROR] InnoDB: Operating system error number 13
in a file operation.
2018-02-10T17:30:08.421273Z 0 [ERROR] InnoDB: The error means mysqld does not
have the access rights to the directory.
2018-02-10T17:30:08.421297Z 0 [ERROR] InnoDB: Operating system error number 13
in a file operation.
2018-02-10T17:30:08.421319Z 0 [ERROR] InnoDB: The error means mysqld does not
have the access rights to the directory.
2018-02-10T17:30:08.421340Z 0 [ERROR] InnoDB: Cannot open datafile './ibdata1'
2018-02-10T17:30:08.421364Z 0 [ERROR] InnoDB: Could not open or create the
system tablespace. If you tried to add new data files to the system tablespace,
and it failed here, you should now edit innodb_data_file_path in my.cnf back to
what it was, and remove the new ibdata files InnoDB created in this failed
attempt. InnoDB only wrote those files full of zeros, but did not yet use them
in any way. But be careful: do not remove old data files which contain your
precious data!
2018-02-10T17:30:08.421389Z 0 [ERROR] InnoDB: InnoDB Database creation was
aborted with error Cannot open a file. You may need to delete the ibdata1 file
before trying to start up again.
And very very likely related to that apparmor denies:
[17112.114807] audit: type=1400 audit(1518282130.859:38): apparmor="DENIED"
operation="mknod" profile="/usr/sbin/mysqld" name="/db/mysql/N200.lower-test"
pid=16095 comm="mysqld" requested_mask="c" denied_mask="c" fsuid=125 ouid=125
[17112.303168] audit: type=1400 audit(1518282131.047:39): apparmor="DENIED"
operation="mknod" profile="/usr/sbin/mysqld" name="/db/mysql/N200.lower-test"
pid=16095 comm="mysqld" requested_mask="c" denied_mask="c" fsuid=125 ouid=125
[17112.303241] audit: type=1400 audit(1518282131.047:40): apparmor="DENIED"
operation="mknod" profile="/usr/sbin/mysqld" name="/db/mysql/N200.lower-test"
pid=16095 comm="mysqld" requested_mask="c" denied_mask="c" fsuid=125 ouid=125
So your alias file /etc/apparmor.d/tunables/alias should maybe look like:
alias /var/lib/mysql/ -> /db/mysql/,
It isn't attached, is that your content?
** Changed in: mysql-5.7 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1748654
Title:
package mysql-server-5.7 5.7.21-0ubuntu0.16.04.1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1 - nonstandard location
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