Resolving errors generated when attempting to restore using a mysqldump file (2 replies)

I have a problem restoring some databases. The original server was running 5.6. The new server is running 8.0. Both servers were setup with INNODB. I do NOT have the original ibdata1 or iblogfiles. What I do have is a mysqldump file of all databases (including mysql.) The OS is FreeBSD 13.0-RELEASE, if that matters.

When i run 'mysql -u root -p < mysqldumpfile.sql' I get the following error:

ERROR 3554 (HY000) at line 1624: Access to system table 'mysql.innodb_index_stats' is rejected.

Is there a way to force this to overwrite?

I figured that it was a new restriction on restoring databases, so I copied the mysqldump file and edited the copy, removing lines 1651-1677. That removed the section dealing with innodb_table_stats

I then ran the command again, using the edited copy. I got the following error:
ERROR 1062 (23000) at line 6867: Duplicate entry 'quảng độ' for key 'bak_fv2hu_finder_terms.idx_term'

This is in the most important db of them all. What do I have to do to fix this error?

And, if I can restore everything including the mysql db (without innodb_table_stats) will i get the user and privilege grants back as well? Or will I have to set all that up again?

Assume I'm an apprentice when it comes to mysql. I am not a db guru nor am I a programmer. I'm a sysadmin.