Can anyone please explain what Akonadi is and why it is suddenly needed by Kontact? My Akonadi is not running and I don't know how to make it run. My Kontact does not start at all after upgrading to Lucid (Ubuntu 10.4) The following line keeps on scrolling when I start Kontact in Terminal: kontact(1999)/libakonadi Akonadi::SessionPrivate::socketError: Socket error occurred: "QLocalSocket::connectToServer: Connection refused" Below is the report generated when I click on the Detail link in the Akonadi Configuration appication window: Akonadi Server Self-Test Report =============================== Test 1: SUCCESS -------- Database driver found. Details: The QtSQL driver 'QMYSQL' is required by your current Akonadi server configuration and was found on your system. File content of '/home/marius/.config/akonadi/akonadiserverrc': [%General] Driver=QMYSQL SizeThreshold=4096 ExternalPayload=false [QMYSQL] Name=akonadi User= Password= Options="UNIX_SOCKET=/home/marius/.local/share/akonadi/db_misc/mysql.socket" ServerPath=/usr/sbin/mysqld-akonadi StartServer=true Host= [Debug] Tracer=null Test 2: SUCCESS -------- MySQL server found. Details: You currently have configured Akonadi to use the MySQL server '/usr/sbin/mysqld-akonadi'. Make sure you have the MySQL server installed, set the correct path and ensure you have the necessary read and execution rights on the server executable. The server executable is typically called 'mysqld', its locations varies depending on the distribution. Test 3: SUCCESS -------- MySQL server is executable. Details: MySQL server found: /usr/sbin/mysqld-akonadi Ver 5.1.41-3ubuntu11 for debian-linux-gnu on i486 ((Ubuntu)) Test 4: ERROR -------- MySQL server log contains errors. Details: The MySQL server error log file '/home/marius/.local/share/akonadi/db_data/mysql.err' contains errors. File content of '/home/marius/.local/share/akonadi/db_data/mysql.err': 100627 9:44:49 [Note] Plugin 'FEDERATED' is disabled. InnoDB: No valid checkpoint found. InnoDB: If this error appears when you are creating an InnoDB database, InnoDB: the problem may be that during an earlier attempt you managed InnoDB: to create the InnoDB data files, but log file creation failed. InnoDB: If that is the case, please refer to InnoDB: http://dev.mysql.com/doc/refman/5.1/en/error-creating-innodb.html 100627 9:44:49 [ERROR] Plugin 'InnoDB' init function returned error. 100627 9:44:49 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 100627 9:44:49 [ERROR] Unknown/unsupported table type: innodb 100627 9:44:49 [ERROR] Aborting 100627 9:44:49 [Note] /usr/sbin/mysqld-akonadi: Shutdown complete Test 5: SUCCESS -------- MySQL server default configuration found. Details: The default configuration for the MySQL server was found and is readable at /etc/akonadi/mysql-global.conf. File content of '/etc/akonadi/mysql-global.conf': # # Global Akonadi MySQL server settings, # These settings can be adjusted using $HOME/.config/akonadi/mysql-local.conf # # Based on advice by Kris Köhntopp