I am in the same boat, upgrade gave me all those errors and now I cannont log in. Site looks ok, but I can’t access the admin “You do not have sufficient permissions to access this page.”
I am guess the users table didn’t get updated correctly? Also my catergories seem to not be working correctly
I tried to create a new account to login to and got this error message:
WordPress database error: [Table ‘mackersl_peterdorsi.wp_usermeta’ doesn’t exist]
SELECT meta_key, meta_value FROM wp_usermeta WHERE user_id = ‘2’
When checking in phpmyadmin I can see that there is no “wp_usermeta” table in the DB.