Hi,
I built Ubuntu today following the instructions at: https://forum.audacityteam.org/t/building-audacity-2-3-1-on-ubuntu-18-04/52255/1 The only notes I had were:
Step 3: when running apt-get build-dep audacity, I was prompted that I also needed portaudio19-dev; so I installed that first and ran build-dep audacity again.
Step 10: I can never keep cores and threads straight, so I queried using: cat /proc/cpuinfo | grep processor | wc -l
Seems to be working fine, so thanks for the guide!