I doubt that path is correct; I highly doubt your new host has inetpub since it's a linux host... you'll want to get the new full path from the host.
They'll likely give you the full path to the directory under your web root (where you end up when you login via a FTP client) from here you'd have to direct it to your ubb install.
Example, if they tell you:
/home/yoursite.tld/
And when you login to your FTP you see "public_html" and you have a "forum" directory under that, then your UBB directory would be:
/home/yoursite.tld/public_html/forum
