[SOLVED] new install issues

[Snoopy8]

is the OS I have installed as Base. (official Rpi4)

Sorry, you cannot use the Raspberry Pi OS. You have to use Ubuntu 24.0 Server (or Desktop).

[rrunner]

I have tried creating Ubuntu 24.0 server arm image version using rasberry pi imager. On SD card as well as usb drive but for some reason all I see is a 5mb drive with efi folder and an additional drive which is unreadable in windows. When i try inserting either of these for boot in Rpi4, it is not showing the grub screen or booting up.