Commenting out the config.vagrant.plugins line in the Vagrantfile seemed to resolve the issue. I'm on Ubuntu 18.04.
Does /vagrant still correctly point to the vagrant_share directory on the host machine? I would expect it to be necessary to edit that share to not use sshfs.
Yes, /vagrant seems to be mounted correctly and created files show up on the host machine
That's just a hint to Vagrant to make sure the plugin is installed. If it's installed already, then you don't need that line. It seems this variable was added in a recent Vagrant version. Can you get a more recent version from your distro?
Yeah that's the problem, config.vagrant.plugins was added in 2.2.0 but Ubuntu 18.04 includes 2.0.3. The best fix is probably to add a Vagrant.require_version ">= 2.2.0" line to the Vagrantfile to ensure a supported version is used. I'll make a PR for it.
Should be fixed by ee5de7e3be2ec9bcca5c28969b3d47b035b991b1. Please upgrade your Vagrant installation.
proton 4.2x1 2019-06
but i'm already install vagrant-sshfs