I am installing Ubuntu 15.10 (final) and I encountered this issue (exactly as described by the original poster).
This issue is mentioned in https://wiki.ubuntu.com/WilyWerewolf/ReleaseNotes as well, in the Known Issues section.
However, in my case the Force UEFI dialog cannot be closed, thus, it is not possible to continue the installation.
I am installing Ubuntu 15.10 (final) and I encountered this issue (exactly as described by the original poster). /wiki.ubuntu. com/WilyWerewol f/ReleaseNotes as well, in the Known Issues section.
This issue is mentioned in https:/
However, in my case the Force UEFI dialog cannot be closed, thus, it is not possible to continue the installation.