It's me again! Otto, I found out that it is an Akonadi problem: Akonadi uses Mariadb as default database, but does not provide mysqlcheck through dependencies. Now I could repair the table structure with that knowledge, see the attached file.
Would you please add the Akonadi maintainer to this bug report? Best regards Ulrich
*** b e f o r e *** bequimao@bullseye-kde:~$ cat .local/share/akonadi/db_data/mysql.err 2021-11-20 14:36:37 0 [Warning] WSREP: Failed to guess base node address. Set it explicitly via wsrep_node_address. 2021-11-20 14:36:37 0 [Warning] WSREP: Failed to guess base node address. Set it explicitly via wsrep_node_address. 2021-11-20 14:36:37 0 [Warning] WSREP: Guessing address for incoming client connections failed. Try setting wsrep_node_incoming_address explicitly. 2021-11-20 14:36:37 0 [Note] WSREP: Node addr: 2021-11-20 14:36:37 0 [Note] InnoDB: Uses event mutexes 2021-11-20 14:36:37 0 [Note] InnoDB: Compressed tables use zlib 1.2.11 2021-11-20 14:36:37 0 [Note] InnoDB: Number of pools: 1 2021-11-20 14:36:37 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions 2021-11-20 14:36:37 0 [Note] mysqld: O_TMPFILE is not supported on /tmp (disabling future attempts) 2021-11-20 14:36:37 0 [Note] InnoDB: Using Linux native AIO 2021-11-20 14:36:37 0 [Note] InnoDB: Initializing buffer pool, total size = 134217728, chunk size = 134217728 2021-11-20 14:36:37 0 [Note] InnoDB: Completed initialization of buffer pool 2021-11-20 14:36:38 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=2932771735,2932771735 2021-11-20 14:36:44 0 [Note] InnoDB: Starting final batch to recover 231 pages from redo log. 2021-11-20 14:36:47 0 [Note] InnoDB: 128 rollback segments are active. 2021-11-20 14:36:47 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1" 2021-11-20 14:36:47 0 [Note] InnoDB: Creating shared tablespace for temporary tables 2021-11-20 14:36:47 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ... 2021-11-20 14:36:47 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB. 2021-11-20 14:36:47 0 [Note] InnoDB: 10.5.12 started; log sequence number 2933960231; transaction id 3191906 2021-11-20 14:36:47 0 [Note] InnoDB: Loading buffer pool(s) from /home/bequimao/.local/share/akonadi/db_data/ib_buffer_pool 2021-11-20 14:36:47 0 [Note] Plugin 'FEEDBACK' is disabled. 2021-11-20 14:36:48 1 [Warning] Failed to load slave replication state from table mysql.gtid_slave_pos: 1146: Table 'mysql.gtid_slave_pos' doesn't exist 2021-11-20 14:36:48 0 [Note] Reading of all Master_info entries succeeded 2021-11-20 14:36:48 0 [Note] Added new Master_info '' to hash table 2021-11-20 14:36:48 0 [Note] /usr/sbin/mysqld: ready for connections. Version: '10.5.12-MariaDB-0+deb11u1' socket: '/run/user/1000/akonadi/mysql.socket' port: 0 Debian 11 2021-11-20 14:36:48 4 [ERROR] InnoDB: Table `mysql`.`innodb_table_stats` not found. 2021-11-20 14:36:54 0 [Note] InnoDB: Buffer pool(s) load completed at 211120 14:36:54 bequimao@bullseye-kde:~$ bequimao@bullseye-kde:~$ mysql_upgrade --socket=/run/user/1000/akonadi/mysql.socket -v Looking for 'mysql' as: mysql Looking for 'mysqlcheck' as: mysqlcheck FATAL ERROR: Can't execute 'mysqlcheck' bequimao@bullseye-kde:~$ bequimao@bullseye-kde:~$ *** r o o t **** root@bullseye-kde:~# dpkg -l | egrep 'mysql|mariadb|akonadi' | egrep -v libkf5 | sort ii akonadi-backend-mysql 4:20.08.3-3 all MySQL storage backend for Akonadi ii akonadiconsole 4:20.08.3-1 amd64 management and debugging console for akonadi ii akonadi-contacts-data 4:20.08.3-1 all Akonadi contacts access library - data files ii akonadi-mime-data 4:20.08.3-1 all Akonadi MIME handling library - data files ii akonadi-server 4:20.08.3-3 amd64 Akonadi PIM storage service ii default-mysql-client-core 1.0.7 all MySQL database core client binaries (metapackage) ii kmailtransport-akonadi:amd64 20.08.3-1 amd64 mail transport akonadi library ii libmariadb3:amd64 1:10.5.12-0+deb11u1 amd64 MariaDB database client library ii libqt5sql5-mysql:amd64 5.15.2+dfsg-9 amd64 Qt 5 MySQL database driver ii libreoffice-sdbc-mysql 1:7.0.4-4+deb11u1 amd64 MariaDB/MySQL SDBC driver for LibreOffice ii mariadb-client-core-10.5 1:10.5.12-0+deb11u1 amd64 MariaDB database core client binaries ii mariadb-common 1:10.5.12-0+deb11u1 all MariaDB common configuration files ii mariadb-server-core-10.5 1:10.5.12-0+deb11u1 amd64 MariaDB database core server files ii mysql-common 5.8+1.0.7 all MySQL database common files, e.g. /etc/mysql/my.cnf root@bullseye-kde:~# apt-file search mysqlcheck mariadb-client-10.5: /usr/bin/mysqlcheck mariadb-client-core-10.5: /usr/share/man/man1/mysqlcheck.1.gz mariadb-test-data: /usr/share/mysql/mysql-test/main/mysqlcheck-master.opt mariadb-test-data: /usr/share/mysql/mysql-test/main/mysqlcheck.opt mariadb-test-data: /usr/share/mysql/mysql-test/main/mysqlcheck.result mariadb-test-data: /usr/share/mysql/mysql-test/main/mysqlcheck.test root@bullseye-kde:~# root@bullseye-kde:~# apt-get install mariadb-client Reading package lists... Done Building dependency tree... Done Reading state information... Done The following package was automatically installed and is no longer required: linux-image-4.19.0-17-amd64 Use 'apt autoremove' to remove it. The following additional packages will be installed: libconfig-inifiles-perl libdbd-mariadb-perl libdbi-perl libterm-readkey-perl mariadb-client-10.5 Suggested packages: libmldbm-perl libnet-daemon-perl libsql-statement-perl The following NEW packages will be installed: libconfig-inifiles-perl libdbd-mariadb-perl libdbi-perl libterm-readkey-perl mariadb-client mariadb-client-10.5 0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded. .... *** a f t e r *** bequimao@bullseye-kde:~$ mysql_upgrade --socket=/run/user/1000/akonadi/mysql.socket -v Looking for 'mysql' as: mysql Looking for 'mysqlcheck' as: mysqlcheck MariaDB upgrade detected Phase 1/7: Checking and upgrading mysql database Processing databases mysql 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.host OK mysql.ndb_binlog_index OK mysql.plugin OK mysql.proc OK mysql.procs_priv OK mysql.proxies_priv OK mysql.servers 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 Upgrading from a version before MariaDB-10.1 Phase 2/7: Installing used storage engines Checking for tables with unknown storage engine Phase 3/7: Fixing views from mysql Processing databases akonadi information_schema mysql performance_schema Phase 4/7: Running 'mysql_fix_privilege_tables' Phase 5/7: Fixing table and database names Processing databases akonadi information_schema mysql performance_schema Phase 6/7: Checking and upgrading tables Processing databases akonadi 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 OK akonadi.relationtypetable OK akonadi.resourcetable OK akonadi.schemaversiontable OK akonadi.tagattributetable OK akonadi.tagremoteidresourcerelationtable OK akonadi.tagtable OK akonadi.tagtypetable OK information_schema performance_schema Phase 7/7: Running 'FLUSH PRIVILEGES' OK bequimao@bullseye-kde:~$ *** r e b o o t *** bequimao@bullseye-kde:~$ cat .local/share/akonadi/db_data/mysql.err 2021-11-20 15:09:51 0 [Note] InnoDB: Uses event mutexes 2021-11-20 15:09:51 0 [Note] InnoDB: Compressed tables use zlib 1.2.11 2021-11-20 15:09:51 0 [Note] InnoDB: Number of pools: 1 2021-11-20 15:09:51 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions 2021-11-20 15:09:51 0 [Note] mysqld: O_TMPFILE is not supported on /tmp (disabling future attempts) 2021-11-20 15:09:51 0 [Note] InnoDB: Using Linux native AIO 2021-11-20 15:09:51 0 [Note] InnoDB: Initializing buffer pool, total size = 134217728, chunk size = 134217728 2021-11-20 15:09:51 0 [Note] InnoDB: Completed initialization of buffer pool 2021-11-20 15:09:56 0 [Note] InnoDB: 128 rollback segments are active. 2021-11-20 15:09:57 0 [Note] InnoDB: Creating shared tablespace for temporary tables 2021-11-20 15:09:57 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ... 2021-11-20 15:09:57 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB. 2021-11-20 15:09:57 0 [Note] InnoDB: 10.5.12 started; log sequence number 2934271776; transaction id 3192329 2021-11-20 15:09:57 0 [Note] InnoDB: Loading buffer pool(s) from /home/bequimao/.local/share/akonadi/db_data/ib_buffer_pool 2021-11-20 15:09:57 0 [Note] Plugin 'FEEDBACK' is disabled. 2021-11-20 15:09:57 0 [Note] Reading of all Master_info entries succeeded 2021-11-20 15:09:57 0 [Note] Added new Master_info '' to hash table 2021-11-20 15:09:57 0 [Note] /usr/sbin/mysqld: ready for connections. Version: '10.5.12-MariaDB-0+deb11u1' socket: '/run/user/1000/akonadi/mysql.socket' port: 0 Debian 11 2021-11-20 15:10:06 0 [Note] InnoDB: Buffer pool(s) load completed at 211120 15:10:06 bequimao@bullseye-kde:~$

