nvim_echo is nil value

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I'm getting:

E5108: Error executing lua /home/mc/.vim/plugged/lightspeed.nvim/lua/lightspeed.lua:35: attempt to call field 'nvim_echo' (a nil value) when I try hitting s after installing via Plug.

I've pulled the very latest Neovim nightly (Ubuntu) on two different machines:

> apt policy neovim
neovim:
  Installed: 0.5.0+ubuntu2+git202106150022-b28d458f8-d569569c9-e70091b15~ubuntu18.04.1
  Candidate: 0.5.0+ubuntu2+git202106150022-b28d458f8-d569569c9-e70091b15~ubuntu18.04.1
  Version table:
 *** 0.5.0+ubuntu2+git202106150022-b28d458f8-d569569c9-e70091b15~ubuntu18.04.1 500
        500 http://ppa.launchpad.net/neovim-ppa/unstable/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status
     0.4.4-1~ubuntu18.04.1~ppa1 500
        500 http://ppa.launchpad.net/neovim-ppa/stable/ubuntu bionic/main amd64 Packages
     0.2.2-3 500
        500 http://au.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages

I've also tried a minimal vimrc file with only this Plug install and nothing else - same error.

This looks like a Neovim / Lua API problem - It was my understanding that Lua was now bundled with Neovim. Is there some way to check I have a compatible version of Lua compiled into Neovim correctly?

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Update - this does seem to work with the nightly AppImage for some reason but not the nightly PPA.

Problem is probably on the NeoVim distribution rather than this plugin.

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Alright, after more investigation it looks like the Ubuntu PPA is waaaay behind the actual source build.

Closing this.