I just read someone say LNBits retired the extension. Not sure if that is accurate. But it could disappear with another update. I’ll have to check.
I saw the exact same thing. @calle 👁️⚡👁️ said the Cashu Nutsack or something or other (J/K it's called Nutshell) can be used. I don't have a Linux box though. I'm sure if I'm patient a solution will present itself.