sudo apt purge apparmor
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  python3-apparmor python3-libapparmor
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  apparmor* apparmor-utils* gnome-software-plugin-snap* snapd*
0 upgraded, 0 newly installed, 4 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 82.8 MB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 264909 files and directories currently installed.)
Removing gnome-software-plugin-snap (3.30.6-2ubuntu10) ...
Removing snapd (2.41+19.10.1) ...
Removing apparmor-utils (2.13.3-5ubuntu1) ...
Removing apparmor (2.13.3-5ubuntu1) ...
Setting up mysql-server-8.0 (8.0.17-0ubuntu2) ...
Renaming removed key_buffer and myisam-recover options (if present)
mysqld will log errors to /var/log/mysql/error.log
2019-11-18T03:17:52.341454Z 0 [ERROR] [MY-011065] [Server] Unable to determine i
f daemon is running: No such file or directory (rc=0).
2019-11-18T03:17:52.341466Z 0 [ERROR] [MY-010946] [Server] Failed to start mysql
d daemon. Check mysqld error log.
Warning: Unable to start the server.
Job for mysql.service failed because the control process exited with error code.
See "systemctl status mysql.service" and "journalctl -xe" for details.
invoke-rc.d: initscript mysql, action "start" failed.
● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: en
abled)
   Active: activating (auto-restart) (Result: exit-code) since Sun 2019-11-17 22
:17:53 EST; 5ms ago
  Process: 6388 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exit
ed, status=0/SUCCESS)
  Process: 6396 ExecStart=/usr/sbin/mysqld (code=exited, status=2)
 Main PID: 6396 (code=exited, status=2)
   Status: "Server startup in progress"
dpkg: error processing package mysql-server-8.0 (--configure):
 installed mysql-server-8.0 package post-installation script subprocess returned
 error exit status 1
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-8.0; however:
  Package mysql-server-8.0 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup erro
r from a previous failure.
                          Processing triggers for desktop-file-utils (0.24-1ubun
tu1) ...
Processing triggers for mime-support (3.63ubuntu1) ...
Processing triggers for gnome-menus (3.32.0-1ubuntu1) ...
Processing triggers for man-db (2.8.7-3) ...
Processing triggers for bamfdaemon (0.5.3+18.04.20180207.2-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Errors were encountered while processing:
 mysql-server-8.0
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)