Follow-up to previous note: as suggested here: https://www.kubuntuforums.net/showthread.php?67801-Kontact-Reports-that-Akonadi-in-not-Operational&p=370725&viewfull=1#post370725 I removed the two files ~/.local/share/akonadi/db_data/ib_logfile0 and ~/.local/share/akonadi/db_data/ib_logfile1 The result follows. It started the db but is missing a table. I will continue to look for old config files that seem to confuse it. $ akonadictl start Starting Akonadi Server... done. Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString) richard@minerva:~/.local/share/akonadi/db_data$ search paths: ("/home/richard/bin", "/usr/local/sbin", "/usr/local/bin", "/usr/sbin", "/usr/bin", "/sbin", "/bin", "/usr/games", "/usr/local/games", "/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: "" Found mysqlcheck: "/usr/bin/mysqlcheck" akonadi.collectionattributetable OK akonadi.collectionmimetyperelation OK akonadi.collectionpimitemrelation OK akonadi.collectiontable OK akonadi.flagtable OK akonadi.mimetypetable OK akonadi.parttable OK akonadi.parttypetable OK akonadi.pimitemflagrelation OK akonadi.pimitemtable OK akonadi.pimitemtagrelation OK akonadi.relationtable Error : Table 'akonadi.relationtable' doesn't exist in engine status : Operation failed akonadi.relationtypetable Error : Table 'akonadi.relationtypetable' doesn't exist in engine status : Operation failed akonadi.resourcetable OK akonadi.schemaversiontable OK akonadi.tagattributetable OK akonadi.tagremoteidresourcerelationtable OK akonadi.tagtable OK akonadi.tagtypetable OK mysql.columns_priv OK mysql.db OK mysql.event OK mysql.func OK mysql.help_category OK mysql.help_keyword OK mysql.help_relation OK mysql.help_topic OK mysql.innodb_index_stats OK mysql.innodb_table_stats OK mysql.ndb_binlog_index OK mysql.plugin OK mysql.proc OK mysql.procs_priv OK mysql.proxies_priv OK mysql.servers OK mysql.slave_master_info OK mysql.slave_relay_log_info OK mysql.slave_worker_info OK mysql.tables_priv OK mysql.time_zone OK mysql.time_zone_leap_second OK mysql.time_zone_name OK mysql.time_zone_transition OK mysql.time_zone_transition_type OK mysql.user OK Repairing tables test.relationtable Error : Table 'test.relationtable' doesn't exist status : Operation failed test.relationtypetable Error : Table 'test.relationtypetable' doesn't exist status : Operation failed MySQL version OK (required "5.1" , available "10.0" ) Database "akonadi" opened using driver "QMYSQL" DbInitializer::run() checking table "SchemaVersionTable" checking table "ResourceTable" checking table "CollectionTable" checking table "MimeTypeTable" checking table "PimItemTable" checking table "FlagTable" checking table "PartTypeTable" checking table "PartTable" checking table "CollectionAttributeTable" checking table "TagTypeTable" checking table "TagTable" checking table "TagAttributeTable" checking table "TagRemoteIdResourceRelationTable" checking table "RelationTypeTable" "ALTER TABLE RelationTypeTable ADD COLUMN id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY" " Sql error: Table 'akonadi.relationtypetable' doesn't exist in engine QMYSQL: Unable to execute query Query: ALTER TABLE RelationTypeTable ADD COLUMN id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY" Unable to initialize database. "[ 0: akonadiserver() [0x57e2f6] 1: akonadiserver() [0x57e61e] 2: /lib/x86_64-linux-gnu/libc.so.6(+0x352f0) [0x7fb9efbc32f0] 3: /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x37) [0x7fb9efbc3267] 4: /lib/x86_64-linux-gnu/libc.so.6(abort+0x16a) [0x7fb9efbc4eca] 5: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_Z17qt_message_output9QtMsgTypeRK18QMessageLogContextRK7QString+0x185) [0x7fb9f05813d5] 6: akonadiserver() [0x580c1c] 7: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN9QIODevice5writeEPKcx+0x10b) [0x7fb9f069c49b] 8: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(+0x1bca26) [0x7fb9f06ada26] 9: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN11QTextStreamD2Ev+0x11b) [0x7fb9f06adc6b] 10: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN6QDebugD1Ev+0x3f) [0x7fb9f067ebdf] 11: akonadiserver() [0x422686] 12: akonadiserver() [0x503289] 13: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN7QObject5eventEP6QEvent+0xf1) [0x7fb9f07a4651] 14: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent+0xbc) [0x7fb9f0772efc] 15: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData+0x2c7) [0x7fb9f0775057] 16: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(+0x2d8e73) [0x7fb9f07c9e73] 17: /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x2a7) [0x7fb9ee5e6ff7] 18: /lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4a250) [0x7fb9ee5e7250] 19: /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x2c) [0x7fb9ee5e72fc] 20: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE+0x5f) [0x7fb9f07ca27f] 21: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE+0x10a) [0x7fb9f077075a] 22: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN16QCoreApplication4execEv+0x9c) [0x7fb9f07782cc] 23: akonadiserver() [0x41fa79] 24: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7fb9efbaea40] 25: akonadiserver(_start+0x29) [0x4204e9] ] " ProcessControl: Application 'akonadiserver' returned with exit code 255 (Unknown error)