我刚刚从Ubuntu 14.04升级到Ubuntu 16.04。 16.04，Akonadi服务器无法启动。我需要它来运行我的邮件客户端kMail。我得到的输出：
akonadictl start
是：
starting Akonadi Server...
done.
然后：
$ Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
search paths: ("/home/peter/.sdkman/candidates/grails/current/bin", "/opt/jdk1.7.0_79/bin", "/opt/apache-tomcat-8.0.32/bin", "/usr/local/sbin", "/usr/local/bin", "/usr/sbin", "/usr/bin", "/sbin", "/bin", "/usr/games", "/usr/local/games", "/snap/bin", "/usr/sbin", "/usr/local/sbin", "/usr/local/libexec", "/usr/libexec", "/opt/mysql/libexec", "/opt/local/lib/mysql5/bin", "/opt/mysql/sbin")
Found mysql_install_db: "/usr/bin/mysql_install_db"
Found mysqlcheck: "/usr/bin/mysqlcheck"
Database process exited unexpectedly during initial connection!
executable: "/usr/sbin/mysqld-akonadi"
arguments: ("--defaults-file=/home/peter/.local/share/akonadi/mysql.conf", "--datadir=/home/peter/.local/share/akonadi/db_data/", "--socket=/tmp/akonadi-peter.JeGtpj/mysql.socket")
stdout: ""
stderr: ""
exit code: 1
process error: "Unknown error"
terminating service threads
terminating connection threads
stopping db process
Failed to remove Unix socket
Failed to remove runtime connection config file
Application 'akonadiserver' exited normally...
Peter