These suggestions did not work in my case. I had to uninstall 17.5 and reinstalled 17.0.2 before I could have internet in the VMs.

Below are my issues:
After upgrading from 17.0.2 to 17.5, I noticed that the VMs could not access the internet.
The VMs did receive IP addresses from NAT.
I could ping the VMs from the host.
I could ping the host from the VMs.
I couldn't ping the NAT gateway from the VMs.
The bridge network was working.