Hi,
I just updated from 10.2.15 to 10.2.16 and the sql server is not starting anymore.

2018-07-04 12:29:07 0 [ERROR] Can't open and lock privilege tables: Table './mysql/servers.MYI' is read only
2018-07-04 12:29:07 0 [Note] Server socket created on IP: '::'.
2018-07-04 12:29:07 0 [ERROR] Fatal error: Can't open and lock privilege tables: Table './mysql/user.MYI' is read only

I tried to update to 10.3.8 too, same result.
I made a backup for /home/mysql and try to reinstall mariadb (https://help.directadmin.com/item.php?id=563)
Same results.

Any ideeas?