AppInventor Emulator For Raspberry Pi (Linux ARM)

Is there a way to put the AI2 Emulator on Ubuntu ARM (specifically Raspberry Pi), or is there another Android emulator that may work? I followed the instructions here but to no avail.

You could try this, although it might be a bit resource heavy for an RPI...

The VirtualBox .deb file does not install, snap says it has unmet dependencies (which, based on experience, means the program is incompatible with my system).

Yes, some research has revealed that virtualbox cannot be installed on arm architecture.

Why do you want an android emulator on RPI? Maybe it's better to install Android on RPI?

And where may I download an Android ISO?

Search google. I found e.g. this: