Fixed!
I ran from the command line:
plesk installer install-all-updates
I saw that it was complaining about missing some tables, after checking that they indeed did not exist in the psa db, I recovered them from the last backup like this:
cd /var/lib/psa/dumps
zcat mysql.daily.dump.0.gz |...
This morning my Plesk has been updated, but now I can't access the panel and it shows me the error "ERR_CONNECTION_REFUSED" on both port 8443 and 8447.
I have checked with "sudo netstat -tuln | grep 8443" that there is nothing listening on the port.
I have looked at...