Cannot run unix process in Ubuntu on Virtualbox

[deciduously]

The following target failed to build:

export const testSubprocess = tg.target(async () => {
 return await tg
 .target("echo 'hello' > $OUTPUT")
 .then((t) => t.output())
 .then(tg.File.expect)
 .then((f) => f.text());
});

The error is "failed to receive the PID of the guest process from the socket".