Oggi ho installato Kde Neon basata su ubuntu 18.04 , e ora sto notando che non parte un certo Akonadi , o comunque fa errore ! Lo noto perché vorrei aprire kalarm e korganizer e anche con il sudo hanno il messaggio che Akonadi non è operativo,ci sono soluzioni ?

con il comando akonadictl start

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 akonadictl start roberto@roberto-desktop:~$ Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
mysqld: [ERROR] Could not open required defaults file: /home/roberto/
mysqld: [ERROR] Fatal error in defaults handling. Program aborted!
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/roberto/.local/share/akonadi/mysql.conf", "--datadir=/home/roberto/.local/share/akonadi/db_data/", "--socket=/tmp/akonadi-roberto.kFF1pp/mysql.socket", "--pid-file=/tmp/akonadi-roberto.kFF1pp/mysql.pid")
org.kde.pim.akonadiserver: stdout: ""
org.kde.pim.akonadiserver: stderr: "mysqld: Can't change dir to '/home/roberto/.local/share/akonadi/db_data/' (Errcode: 2 - No such file or directory)\n2018-09-28T19:29:39.354945Z 0 [Warning] The syntax '--log_warnings/-W' is deprecated and will be removed in a future release. Please use '--log_error_verbosity' instead.\n2018-09-28T19:29:39.354995Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).\n2018-09-28T19:29:39.355053Z 0 [Warning] Can't create test file /home/roberto/.local/share/akonadi/db_data/roberto-desktop.lower-test\n2018-09-28T19:29:39.373692Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.23-0ubuntu0.18.04.1) starting as process 14960 ...\n2018-09-28T19:29:39.375599Z 0 [Warning] Can't create test file /home/roberto/.local/share/akonadi/db_data/roberto-desktop.lower-test\n2018-09-28T19:29:39.375618Z 0 [Warning] Can't create test file /home/roberto/.local/share/akonadi/db_data/roberto-desktop.lower-test\n2018-09-28T19:29:39.375642Z 0 [ERROR] failed to set datadir to /home/roberto/.local/share/akonadi/db_data/\n2018-09-28T19:29:39.375645Z 0 [ERROR] Aborting\n\n2018-09-28T19:29:39.375651Z 0 [Note] Binlog end\n2018-09-28T19:29:39.375681Z 0 [Note] /usr/sbin/mysqld: Shutdown complete\n\n"
org.kde.pim.akonadiserver: exit code: 1
org.kde.pim.akonadiserver: process error: "Unknown error"
mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/tmp/akonadi-roberto.kFF1pp/mysql.socket' (2)'
Check that mysqld is running and that the socket: '/tmp/akonadi-roberto.kFF1pp/mysql.socket' exists!
org.kde.pim.akonadiserver: Failed to remove runtime connection config file
org.kde.pim.akonadicontrol: Application 'akonadiserver' exited normally...

Risolto , mi hanno consigliato questo https://askubuntu.com/questions/850984/kontact-in-kubuntu-16-10-will-not-start-because-the-akonadi-server-will-not-starink dove ho provato gli ultimi comandi che sono :

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sudo apt-get install apparmor-utils
sudo aa-complain usr.sbin.mysqld-akonadi

e ha funzionato !

Thanks for the hint!

But

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sudo aa-complain usr.sbin.mysqld-akonadi

didn't do the trick for me today, I had to do a

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sudo aa-complain usr.sbin.mysqld

. Akonadi is now able to start again.