The following packages will be upgraded:

  mariadb-server-10.1

1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Need to get 0 B/7230 kB of archives.

After this operation, 1024 B of additional disk space will be used.

Do you want to continue? [Y/n] y

Preconfiguring packages ...

(Reading database ... 156043 files and directories currently installed.)

Preparing to unpack .../mariadb-server-10.1_1%3a10.1.37+maria-1~bionic_amd64.deb ...

Failed to stop mysql.service: Unit mysql.service not loaded.

invoke-rc.d: initscript mysql, action "stop" failed.

dpkg: warning: old mariadb-server-10.1 package pre-removal script subprocess returned error exit status 1

dpkg: trying script from the new package instead ...

Failed to stop mysql.service: Unit mysql.service not loaded.

invoke-rc.d: initscript mysql, action "stop" failed.

dpkg: error processing archive /var/cache/apt/archives/mariadb-server-10.1_1%3a10.1.37+maria-1~bionic_amd64.deb (--unpack):

 new mariadb-server-10.1 package pre-removal script subprocess returned error exit status 1

Failed to stop mysql.service: Unit mysql.service not loaded.

invoke-rc.d: initscript mysql, action "stop" failed.

Errors were encountered while processing:

 /var/cache/apt/archives/mariadb-server-10.1_1%3a10.1.37+maria-1~bionic_amd64.deb

E: Sub-process /usr/bin/dpkg returned an error code (1)