Error during first reboot after installation

after fresh install ubuntu16.04.4, the system hang at the first reboot with the error message attached.

any idea?
Thanks

I’ve moved this to the https://community.ubuntu.com/c/support-help-requests category because this site isn’t designed to take tech support questions. Sorry. I’d recommend using one of the official support channels listed on the https://community.ubuntu.com/t/finding-help/712 page.