Oh I see now, just tried and got the same erros. It's actually because MySQL-8 didn't create the default database it needs to work normally. Been tried to google for any solution with no luck and because I don't have any other mysql-8 installation, I can't figure out which part is missing from Mysql's databases.
But finally, I found and tried my own trick and it works like charm :
- Stop mysql
- Delete folder laragon\data\mysql-8
- Rename my old mysql5.7 data which was laragon\data\mysql_backup to mysql-8 (Actually i didn't rename it, I just copied and pasted it, then I rename it to mysql-8, just in case any trouble should appears)
- Start mysql
- From terminal, change directory to laragon\bin\mysql\mysql-8.0.13-winx64\bin
- Run mysql_upgrade -u root
Wish u luck, mate!