Alright everyone - I got it.

I was misunderstanding what was being said - this is how I did it:

• Download files needed here
• Flash 7.2.1 (stock ROM from Google)
• Flash 4-core TWRP after flashing stock image
• Boot into android
• Enable USB Debugging in Developer menu < - this wasn't needed because I did the rest via TWRP
• Boot into TWRP
• Wipe dalvik, data, and cache
• Reboot into recovery (TWRP)
• Run manual installation steps:

sudo apt install qemu-utils binfmt-support qemu-user-static e2fsprogs sudo simg2img binutils

cd /path/to/files/

./halium-install-standalone.sh -p ut ubports-touch.rootfs-xenial-armhf.tar.gz system.img

adb reboot bootloader

fastboot flash boot halium-boot-4-cores.img

fastboot reboot

I now have a working installation of UBPorts on my angler

Thanks all!

P.S. I have extra files on my NC server that I needed, including the 4-core.img, the 7.2.1 files from Google, TWRP-4-core and it's associated boot script. - if you need them, I have them. Otherwise, they should all likely be hosted by the team in one spot.

@neothethird

Testing on Nexus 6p isn't going well. Will not flash - stalls at 75%. I opened an issue on GH that was closed as a "duplicate". That was for 0.7.4-beta.

That said, see this thread for what I've been dealing with getting UBPorts flashed to the angler.

This is an odd problem and there aren't any real logs to provide you. It just will not flash through the snap (or AppImage, or .deb). Seems to be specific to the angler. Or maybe just mine? I dunno - but I can flash manually, which might indicate something.