After upgrade to debian 9, I get this issue, when trying to do a apt-get upgrade:Failed to start MariaDB database serverHere is the log:Setting up mariadb-server-10.1 (10.1.23-9+deb9u1) ...Job for mariadb.service failed because the control process exited with error code.See systemctl status mariadb.service and journalctl -xe for details.invoke-rc.d: initscript mysql, action start failed. mariadb.service - MariaDB database server   Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)   Active: failed (Result: exit-code) since Wed 2017-07-05 15:44:03 CEST; 9ms ago  Process: 9713 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=exited, status=1/FAILURE)  Process: 9623 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||   VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ]   && systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (code=exited, status=0/SUCCESS)  Process: 9619 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)  Process: 9616 ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld (code=exited, status=0/SUCCESS) Main PID: 9713 (code=exited, status=1/FAILURE)   Status: MariaDB server is downJul 05 15:43:59 v22015121382329682 systemd[1]: Starting MariaDB database server...Jul 05 15:44:00 v22015121382329682 mysqld[9713]: 2017-07-05 15:44:00 140711653892672 [Note] /usr/sbin/mysqld (mysqld 10.1.23-MariaDB-9+deb9u1) starting as process 9713 ...Jul 05 15:44:03 v22015121382329682 systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILUREJul 05 15:44:03 v22015121382329682 systemd[1]: Failed to start MariaDB database server.Jul 05 15:44:03 v22015121382329682 systemd[1]: mariadb.service: Unit entered failed state.Jul 05 15:44:03 v22015121382329682 systemd[1]: mariadb.service: Failed with result 'exit-code'.dpkg: error processing package mariadb-server-10.1 (--configure): subprocess installed post-installation script returned error exit status 1dpkg: dependency problems prevent configuration of default-mysql-server: default-mysql-server depends on mariadb-server-10.1; however:  Package mariadb-server-10.1 is not configured yet.dpkg: error processing package default-mysql-server (--configure): dependency problems - leaving unconfigureddpkg: dependency problems prevent configuration of mysql-server: mysql-server depends on default-mysql-server; however:  Package default-mysql-server is not configured yet.dpkg: error processing package mysql-server (--configure): dependency problems - leaving unconfiguredErrors were encountered while processing: mariadb-server-10.1 default-mysql-server mysql-serverI already tried this tutorial, but still failed:https://askubuntu.com/a/697806/672607How can I fix this issue?
Failed to start MariaDB database server after upgrade to debian 9
debian;mariadb