Question

Sorry, a mysql user with the name x already exists.

Answer 1

While restoring account on cpanel server if you get following error
Sorry, a mysql user with the name x already exists.  then try to delete database user from mysql command line

#mysql

mysql > drop user 'xxxxx'@'localhost';

Afer deleting the username if you still face the same issue then search the user in following directory and remove the username from the files.

grep -Rl USERNAME /var/cpanel/databases/

You can see database username under following file.

/var/cpanel/databases/dbindex.db.cache
/var/cpanel/databases/users.db
/var/cpanel/databases/users.db.cache
/var/cpanel/databases/dbindex.db

You need to delete the username from files and save file, then again try to restore account.