我从 19.10 升级到了 Ubuntu 20.04.2 LTS。现在 Kmail 坏了，因为 Akonadi 无法运行。
akonadictl start给出了以下内容，但我想提请大家注意下面我分离出来的第九行（“有问题的行：“”）
~$ akonadictl start
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
~$ org.kde.pim.akonadiserver: Starting up the Akonadi Server...
org.kde.pim.akonadiserver: database server stopped unexpectedly
org.kde.pim.akonadiserver: Database process exited unexpectedly during initial connection!
org.kde.pim.akonadiserver: executable: "/usr/sbin/mysqld-akonadi"
org.kde.pim.akonadiserver: arguments: ("--defaults-file=/home/panczol/.local/share/akonadi/mysql.conf", "--datadir=/home/panczol/.local/share/akonadi/db_data/", "--socket=/run/user/1000/akonadi/mysql.socket", "--pid-file=/run/user/1000/akonadi/mysql.pid")
org.kde.pim.akonadiserver: stdout: ""
org.kde.pim.akonadiserver: stderr: "mysqld-akonadi: [ERROR] Could not open required defaults file: /home/panczol/.local/share/akonadi/mysql.conf\nmysqld-akonadi: [ERROR] Fatal error in defaults handling. Program aborted!\n"
org.kde.pim.akonadiserver: exit code: 1
org.kde.pim.akonadiserver: process error: "Unknown error"
org.kde.pim.akonadiserver: Failed to remove runtime connection config file
org.kde.pim.akonadiserver: Shutting down AkonadiServer...
org.kde.pim.akonadicontrol: Application '/usr/bin/akonadiserver' exited normally...
有问题的行：
org.kde.pim.akonadiserver: stderr: "mysqld-akonadi: [ERROR] Could not open required defaults file: /home/panczol/.local/share/akonadi/mysql.conf\nmysqld-akonadi: [ERROR] Fatal error in defaults handling. Program aborted!\n"
请注意，文件名mysql.conf\nmysqld-akonadi中有一个嵌入的换行符，表明某些脚本存在错误。
该文件/home/panczol/.local/share/akonadi/mysql.conf存在。
如何纠正这个问题？Google 搜索没有提供任何我认为有用的信息（我可能问错了问题）。