Unfortunately I couldn't reproduce your specific problem @novacadian. It compiled the system without problems.

What I did was that I downloaded Kubuntu's iso image version 18.04.3 LTS 64 bits from https://kubuntu.org/getkubuntu/ I set up the virtual machine in vitual box and then I installed the OS using that iso and updated everything to the latest packages.

Finally, I followed the guide until it finished and I ran the compiled wallet as you can see in the picture.

I don't know what could be happening to you or why is that happening to you. I remember, however, that something similar happened to me when I tried to compile it in my old machine and it had a lot of dependency problems. I wish I could help you more nova, I'm so sorry 🤔 😢