Mariadb upgrade problem

I upgraded mariadb on a Centos 7 box from 5.5 to 10.5 and after updating the tables, mariadb will no longer start. In /var/log/messages, I'm getting the following errors. Any help would be much appreciated!

Mar 23 10:22:20 theo systemd: Starting MariaDB 10.5.19 database server...
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] Starting MariaDB 10.5.19-MariaDB source revision f8a85af8ca1c937b8d4f847477bd282f80251cde as process 15269
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Uses event mutexes
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Compressed tables use zlib 1.2.7
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Number of pools: 1
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Using Linux native AIO
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Initializing buffer pool, total size = 134217728, chunk size = 134217728
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Completed initialization of buffer pool
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: 128 rollback segments are active.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Cannot open datafile for read-only: './mysql/gtid_slave_pos.ibd' OS error: 81
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Could not find a valid tablespace file for ``mysql`.`gtid_slave_pos``. Please refer to https://mariadb.com/kb/en/innodb-data-dictionary-troubleshooting/ for how to resolve the issue.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Warning] InnoDB: Ignoring tablespace for `mysql`.`gtid_slave_pos` because it could not be opened.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Cannot open datafile for read-only: './mysql/innodb_index_stats.ibd' OS error: 81
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Could not find a valid tablespace file for ``mysql`.`innodb_index_stats``. Please refer to https://mariadb.com/kb/en/innodb-data-dictionary-troubleshooting/ for how to resolve the issue.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Warning] InnoDB: Ignoring tablespace for `mysql`.`innodb_index_stats` because it could not be opened.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Cannot open datafile for read-only: './mysql/innodb_table_stats.ibd' OS error: 81
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Could not find a valid tablespace file for ``mysql`.`innodb_table_stats``. Please refer to https://mariadb.com/kb/en/innodb-data-dictionary-troubleshooting/ for how to resolve the issue.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Warning] InnoDB: Ignoring tablespace for `mysql`.`innodb_table_stats` because it could not be opened.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Cannot open datafile for read-only: './mysql/transaction_registry.ibd' OS error: 81
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] InnoDB: Could not find a valid tablespace file for ``mysql`.`transaction_registry``. Please refer to https://mariadb.com/kb/en/innodb-data-dictionary-troubleshooting/ for how to resolve the issue.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Warning] InnoDB: Ignoring tablespace for `mysql`.`transaction_registry` because it could not be opened.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Creating shared tablespace for temporary tables
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: 10.5.19 started; log sequence number 63339738232; transaction id 664540336
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] Plugin 'FEEDBACK' is disabled.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] Could not open mysql.plugin table: "Table 'mysql.plugin' doesn't exist". Some plugins may be not loaded
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] InnoDB: Buffer pool(s) load completed at 230323 10:22:20
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] Can't open and lock privilege tables: Table 'mysql.servers' doesn't exist
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [Note] Server socket created on IP: '::'.
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.db' doesn't exist
Mar 23 10:22:20 theo mariadbd: 2023-03-23 10:22:20 0 [ERROR] Aborting
Mar 23 10:22:20 theo systemd: mariadb.service: main process exited, code=exited, status=1/FAILURE
Mar 23 10:22:20 theo systemd: Failed to start MariaDB 10.5.19 database server.
Mar 23 10:22:20 theo systemd: Unit mariadb.service entered failed state.
Mar 23 10:22:20 theo systemd: mariadb.service failed.