UbuntuDDE Won't Boot

[UxuginLinux]

When I try to install UbuntuDDE on by brand-new custom-built computer, the installation process works fine, but it does not work correctly when I shut down. When I boot, I get strange rainbow lines on the screen overlapping the motherboard splash screen. Interestingly, Windows installs fine. My parts are:

CPU: Ryzen 9 5950X @ 4GHz

GPU: GeForce GT 730 (I know this is an abomination but I couldn't find anything better. Hoping to get a used 3080 when the Eth bomb goes off.)

RAM: 32GB 3600MHz CL16 2x16GB Corsair Vengeance RT

SSD: Sabrent Rocket Q4 1TB

HDD: 4TB 7200RPM Seagate Enterprise

MB: MSI X570-A Pro

Any ideas? Thanks in advance!