root@server-HP-Z420-Workstation:~# apt-get purge mysql*
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Note, selecting 'mysql-testsuite' for glob 'mysql*'
Note, selecting 'mysql-server-5.5' for glob 'mysql*'
Note, selecting 'mysql-server-5.6' for glob 'mysql*'
Note, selecting 'mysql-server-5.7' for glob 'mysql*'
Note, selecting 'mysql-server-8.0' for glob 'mysql*'
Note, selecting 'mysql-client-5.5' for glob 'mysql*'
Note, selecting 'mysql-client-5.6' for glob 'mysql*'
Note, selecting 'mysql-client-5.7' for glob 'mysql*'
Note, selecting 'mysql-client-8.0' for glob 'mysql*'
Note, selecting 'mysql-common' for glob 'mysql*'
Note, selecting 'mysqltcl' for glob 'mysql*'
Note, selecting 'mysql-testsuite-5.5' for glob 'mysql*'
Note, selecting 'mysql-testsuite-5.6' for glob 'mysql*'
Note, selecting 'mysql-testsuite-5.7' for glob 'mysql*'
Note, selecting 'mysql-testsuite-8.0' for glob 'mysql*'
Note, selecting 'mysql-client' for glob 'mysql*'
Note, selecting 'mysql-router' for glob 'mysql*'
Note, selecting 'mysql-sandbox' for glob 'mysql*'
Note, selecting 'mysqltuner' for glob 'mysql*'
Note, selecting 'mysql-common-5.6' for glob 'mysql*'
Note, selecting 'mysql-server' for glob 'mysql*'
Note, selecting 'mysql-server-core-5.5' for glob 'mysql*'
Note, selecting 'mysql-server-core-5.6' for glob 'mysql*'
Note, selecting 'mysql-server-core-5.7' for glob 'mysql*'
Note, selecting 'mysql-server-core-8.0' for glob 'mysql*'
Note, selecting 'mysql-client-core-5.5' for glob 'mysql*'
Note, selecting 'mysql-client-core-5.6' for glob 'mysql*'
Note, selecting 'mysql-client-core-5.7' for glob 'mysql*'
Note, selecting 'mysql-client-core-8.0' for glob 'mysql*'
Note, selecting 'mysql-source-8.0' for glob 'mysql*'
Package 'mysql-client-5.7' is not installed, so not removed
Package 'mysql-client-core-5.7' is not installed, so not removed
Note, selecting 'mysql-common' instead of 'mysql-common-5.6'
Package 'mysql-server-5.5' is not installed, so not removed
Package 'mysql-server-5.7' is not installed, so not removed
Package 'mysql-server-core-5.7' is not installed, so not removed
Package 'mysql-client-core-5.5' is not installed, so not removed
Package 'mysql-client-core-5.6' is not installed, so not removed
Package 'mysql-client-5.5' is not installed, so not removed
Package 'mysql-client-5.6' is not installed, so not removed
Package 'mysql-server-core-5.5' is not installed, so not removed
Package 'mysql-server-core-5.6' is not installed, so not removed
Package 'mysql-server-5.6' is not installed, so not removed
Package 'mysql-testsuite-5.5' is not installed, so not removed
Package 'mysql-testsuite-5.6' is not installed, so not removed
Package 'mysql-testsuite-5.7' is not installed, so not removed
Package 'mysql-sandbox' is not installed, so not removed
Package 'mysqltcl' is not installed, so not removed
Package 'mysqltuner' is not installed, so not removed
Package 'mysql-client' is not installed, so not removed
Package 'mysql-server' is not installed, so not removed
Package 'mysql-router' is not installed, so not removed
Package 'mysql-source-8.0' is not installed, so not removed
Package 'mysql-testsuite' is not installed, so not removed
Package 'mysql-testsuite-8.0' is not installed, so not removed
The following packages will be REMOVED:
  mysql-client-8.0* mysql-client-core-8.0* mysql-common* mysql-server-8.0*
  mysql-server-core-8.0*
0 upgraded, 0 newly installed, 5 to remove and 4 not upgraded.
1 not fully installed or removed.
After this operation, 184 MB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 256105 files and directories currently installed.)
Removing mysql-server-8.0 (8.0.30-0ubuntu0.22.04.1) ...
Failed to stop mysql.service: Unit mysql.service not loaded.
invoke-rc.d: initscript mysql, action "stop" failed.
dpkg: error processing package mysql-server-8.0 (--remove):
 installed mysql-server-8.0 package pre-removal script subprocess returned error exit status 1
dpkg: too many errors, stopping
Failed to stop mysql.service: Unit mysql.service not loaded.
invoke-rc.d: initscript mysql, action "stop" failed.
Failed to start mysql.service: Unit mysql.service failed to load properly, please adjust/correct and reload service manager: File exists
See system logs and 'systemctl status mysql.service' for details.
invoke-rc.d: initscript mysql, action "start" failed.
○ mysql.service
     Loaded: error (Reason: Unit mysql.service failed to load properly, please adjust/correct and reload service manager: File exists)
     Active: inactive (dead)
Warning: The unit file, source configuration file or drop-ins of mysql.service changed on disk. Run 'systemctl daemon-reload' to reload units.
dpkg: error while cleaning up:
 installed mysql-server-8.0 package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 mysql-server-8.0
Processing was halted because there were too many errors.
E: Sub-process /usr/bin/dpkg returned an error code (1)