Ubuntu 22.10 Unity install USB cannot find Win 11 already on SSD

I am using download from Ubuntu Unity 22.10 (Kinetic Kudu) . Lenovo ThinkCentre M83 PC with Win 11 Pro Insider build. USB stick loads with EFI boot set to go to USB before SSD. When I start the install, it goes to the point where it wants to select the partition for the installation and reports there is no other OS on the SSD. However, using FILES on the install USB, I can read my documents on C:\windows\users\myusername. Have also posted on ubuntuforums, but no explanation as to why no OS is found. John