Dear Maintainer,
We had installed and running Multi-instance version of mariadb.
Today when i fire `apt-get dist-upgrade` command mariadb update failed.
The following packages will be upgraded:
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mariadb-server-10.1
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1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
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Need to get 0 B/7230 kB of archives.
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After this operation, 1024 B of additional disk space will be used.
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Do you want to continue? [Y/n] y
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Preconfiguring packages ...
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(Reading database ... 156043 files and directories currently installed.)
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Preparing to unpack .../mariadb-server-10.1_1%3a10.1.37+maria-1~bionic_amd64.deb ...
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Failed to stop mysql.service: Unit mysql.service not loaded.
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invoke-rc.d: initscript mysql, action "stop" failed.
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dpkg: warning: old mariadb-server-10.1 package pre-removal script subprocess returned error exit status 1
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dpkg: trying script from the new package instead ...
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Failed to stop mysql.service: Unit mysql.service not loaded.
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invoke-rc.d: initscript mysql, action "stop" failed.
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dpkg: error processing archive /var/cache/apt/archives/mariadb-server-10.1_1%3a10.1.37+maria-1~bionic_amd64.deb (--unpack):
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new mariadb-server-10.1 package pre-removal script subprocess returned error exit status 1
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Failed to stop mysql.service: Unit mysql.service not loaded.
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invoke-rc.d: initscript mysql, action "stop" failed.
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Errors were encountered while processing:
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/var/cache/apt/archives/mariadb-server-10.1_1%3a10.1.37+maria-1~bionic_amd64.deb
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E: Sub-process /usr/bin/dpkg returned an error code (1)
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When using MariaDB multiple instances the upgrade process shows errors stopping/starting mysql and the servers are not restarted. Would be great if the upgrade scripts could detect running mariadb@xxx services (`systemctl | grep mariadb`??) and stop/restart them, instead of assuming a single mariadb service.