Odoo v12

I'm working on data conversion for a prospect as I'm doing a proof of concept for them.  I've imported data into a local odoo12 install on my windows 10 laptop. I backup the database as normal. Then I try to restore on my hosted Ubuntu 18.04 server and it kicks out to the /web/database/restore page with a "... can't reach this page". The only thing I see in the log file is a "Warning dbname odoo.sql_db: Cursor not closed explicitly Please enable sql debugging to trace the caller.

Is there some kind of issue in move a windows odoo db to a Linux?

Thanks,

Dave