I'm installing Ubuntu Desktop 22.04.2 on a Dell T320. It has a H310 PERC that has been flashed to it. The PERC is recognized in the installation, and the installation seems to run through without issue. I'm not receiving any errors. After the installation, the system reboots, and it cannot boot into the OS. In Legacy BIOS, it says "No Bootable Disks Available" and UEFI shows "Unavailable: ubuntu".
I have tried installing multiple times with either Legacy or UEFI. I have multiple flash drives, and the result is the same across the board. This is not a dual boot system. It is being set up as the sole OS. I was initially trying to install Ubuntu 23.04 live Server, and ran into similar issues. The installation seems to complete without a hitch, but after it reboots it will not boot to the OS. I'm going to stick with Ubuntu desktop at this point, as I've spent nearly 2 weeks on each already. And Desktop is what I've currently got on my flash drives.
I've used both 2.0 & 3.0 USB drives. I've flashed with PowerISO, Rufus, UNetbootin, Universal USB, and others. Again it seems to go through the install perfectly fine. It's after the installation when I run into the problem. I've downloaded the file multiple times. I just don't know where to go from this point. Something will not allow it to boot, after installation CPU 2.2GHz Xeon, 12GB RAM, 500GB HDD (primary).
BIOS UEFI screen:

Boot fail:

System info:
