I'm building from source and I want to run Zrythm without installing

Run glib-compile-schemas data/ and then run zrythm using GSETTINGS_SCHEMA_DIR=data ./build/zrythm

I get unmet dependencies when installing on Ubuntu

Enable the universe repository: sudo add-apt-repository universe

What plugin protocols are supported?

LV2 at the moment. VST2 and VST3 coming soon.