This problem still occurs in Ubuntu 17.04 installer.
If internet is connected before installation and using a blank disk, the "Force UEFI installation" box will pop up after a manual partition. The buttons ("Go Back" and "Continue") on the box do not work, and installation gets stuck here.
Reproducible on multiple machines. Have to disconnect Internet before running the installer.
This problem still occurs in Ubuntu 17.04 installer.
If internet is connected before installation and using a blank disk, the "Force UEFI installation" box will pop up after a manual partition. The buttons ("Go Back" and "Continue") on the box do not work, and installation gets stuck here.
Reproducible on multiple machines. Have to disconnect Internet before running the installer.