[CentOS 7] Upgrade Mysql 5.5 to 10.2

I was able to upgrade to version 10.3 and everything is working fine. However, I got the following error when trying to upgrade the databases

root@myvserver.com:~# mysql_upgrade --force -u root –p
Version check failed. Got the following error when calling the ‘mysql’ command line client
ERROR 1045 (28000): Access denied for user ‘root’@‘localhost’ (using password: NO)
FATAL ERROR: Upgrade failed

Also, I am not able to run systemctl start mysql nor systemctl enable mysql form command line. But then again, In Virtualmin everything seems to be running just fine, although this is due to not having any active databases on this server as all my clients are still running on the apache server. I was able to create a new vhost with a database but do not know if i will run into any issues.

If anyone can see red flags please do share.

Thanks again for your help!