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I got this weird issue today when I restored a full .sql backup from one server to another server using dbForge Studio for MySQL (third party software).
Here is an illustration of the issue:
You problem is incredibly straightforward.
In Linux Systems, the file extensions for a MyISAM table tablename must be
tablename.frmtablename.MYDtablename.MYIThe file extensions are case-sensitive
Windows does not check case-sensitivity for .myd and .myi file extensions, so a MyISAM table in a Windows MySQL instance will allow for this. Such is not the case with Linux.
In your case, let's look at the UsersInGroups table. You evidently have two tables with two different filenames and/or extensions:
UsersInGroups.frmUsersInGroups.MYDUsersInGroups.MYIusersingroups.frmusersingroups.mydusersingroups.myiYou will have to rename the files in the OS so that there are only .MYD and .MYI extensions. You can then query each table using the case-sensitive name UsersInGroups and usersingroups.
If you simply want to replace one with the other. delete the old files, keep the new files, and make sure you only have .MYD and .MYI extensions. BTW .frm must always be lower case.
If you are using dbForge to make a backup of MyISAM tables from a Windows machine and you restore that backup on a Linux machine, you must always remember to change the file extensions after restoring from backup.
I talked about this 5 years ago (How can I move a database from one server to another?)
select * from information_schema.tables where lower(table_name) = 'usersingroup'If there are several tables with the same name, but in different case, quoting the table name might be the cause.