https://github.com/hashicorp/vagrant/issues/10022

gistfile1.txt

 INFO global: Vagrant version: 2.1.2
 INFO global: Ruby version: 2.5.1
 INFO global: RubyGems version: 2.7.7
 INFO global: VAGRANT_LOG="info"
 INFO global: VAGRANT_INSTALLER_EMBEDDED_DIR="/opt/vagrant/embedded"
 INFO global: VAGRANT_EXECUTABLE="/opt/vagrant/embedded/gems/gems/vagrant-2.1.2/bin/vagrant"
 INFO global: VAGRANT_DETECTED_OS="archlinux"
 INFO global: VAGRANT_INSTALLER_ENV="1"
 INFO global: VAGRANT_INSTALLER_VERSION="2"
 WARN global: resolv replacement has not been enabled!
 INFO global: Plugins:
 INFO global:   - facter = [installed: 2.5.1 constraint: > 0]
 INFO global:   - vagrant-share = [installed: 1.1.9 constraint: > 0]
 INFO manager: Registered plugin: heroku
 INFO manager: Registered plugin: noop
 INFO manager: Registered plugin: ftp
 INFO manager: Registered plugin: local-exec
 INFO manager: Registered plugin: atlas
 INFO manager: Registered plugin: docker-provider
 INFO manager: Registered plugin: VirtualBox provider
 INFO manager: Registered plugin: Hyper-V provider
 INFO manager: Registered plugin: SMB synced folders
 INFO manager: Registered plugin: RSync synced folders
 INFO manager: Registered plugin: NFS synced folders
 INFO manager: Registered plugin: kernel
 INFO manager: Registered plugin: winrm communicator
 INFO manager: Registered plugin: windows ssh communicator
 INFO manager: Registered plugin: ssh communicator
 INFO manager: Registered plugin: package command
 INFO manager: Registered plugin: push command
 INFO manager: Registered plugin: status command
 INFO manager: Registered plugin: list-commands command
 INFO manager: Registered plugin: vagrant-login
 INFO manager: Registered plugin: powershell command
 INFO manager: Registered plugin: provision command
 INFO manager: Registered plugin: resume command
 INFO manager: Registered plugin: global-status command
 INFO manager: Registered plugin: init command
 INFO manager: Registered plugin: plugin command
 INFO manager: Registered plugin: help command
 INFO manager: Registered plugin: snapshot command
 INFO manager: Registered plugin: port command
 INFO manager: Registered plugin: reload command
 INFO manager: Registered plugin: ssh-config command
 INFO manager: Registered plugin: rdp command
 INFO manager: Registered plugin: suspend command
 INFO manager: Registered plugin: halt command
 INFO manager: Registered plugin: validate command
 INFO manager: Registered plugin: up command
 INFO manager: Registered plugin: box command
 INFO manager: Registered plugin: destroy command
 INFO manager: Registered plugin: provider command
 INFO manager: Registered plugin: ssh command
 INFO manager: Registered plugin: version command
 INFO manager: Registered plugin: cap command
 INFO manager: Registered plugin: file
 INFO manager: Registered plugin: docker
 INFO manager: Registered plugin: shell
 INFO manager: Registered plugin: CFEngine Provisioner
 INFO manager: Registered plugin: ansible
 INFO manager: Registered plugin: chef
 INFO manager: Registered plugin: puppet
 INFO manager: Registered plugin: salt
 INFO manager: Registered plugin: Arch host
 INFO manager: Registered plugin: Windows host
 INFO manager: Registered plugin: FreeBSD host
 INFO manager: Registered plugin: ALT Platform host
 INFO manager: Registered plugin: null host
 INFO manager: Registered plugin: SUSE host
 INFO manager: Registered plugin: Gentoo host
 INFO manager: Registered plugin: Slackware host
 INFO manager: Registered plugin: Red Hat Enterprise Linux host
 INFO manager: Registered plugin: Mac OS X host
 INFO manager: Registered plugin: Linux host
 INFO manager: Registered plugin: BSD host
 INFO manager: Registered plugin: Debian guest
 INFO manager: Registered plugin: OpenBSD guest
 INFO manager: Registered plugin: VMware Photon guest
 INFO manager: Registered plugin: CoreOS guest
 INFO manager: Registered plugin: Arch guest
 INFO manager: Registered plugin: Kali guest
 INFO manager: Registered plugin: Trisquel guest
 INFO manager: Registered plugin: Ubuntu guest
 INFO manager: Registered plugin: Haiku guest
 INFO manager: Registered plugin: NixOS guest
 INFO manager: Registered plugin: TinyCore Linux guest.
 INFO manager: Registered plugin: SmartOS guest.
 INFO manager: Registered plugin: NetBSD guest
 INFO manager: Registered plugin: Windows guest.
 INFO manager: Registered plugin: Mint guest
 INFO manager: Registered plugin: FreeBSD guest
 INFO manager: Registered plugin: Atomic Host guest
 INFO manager: Registered plugin: Elementary guest
 INFO manager: Registered plugin: Fedora guest
 INFO manager: Registered plugin: ALT Platform guest
 INFO manager: Registered plugin: OmniOS guest.
 INFO manager: Registered plugin: Solaris guest.
 INFO manager: Registered plugin: ESXi guest.
 INFO manager: Registered plugin: PLD Linux guest
 INFO manager: Registered plugin: Funtoo guest
 INFO manager: Registered plugin: DragonFly BSD guest
 INFO manager: Registered plugin: SUSE guest
 INFO manager: Registered plugin: Gentoo guest
 INFO manager: Registered plugin: Slackware guest
 INFO manager: Registered plugin: Amazon Linux guest
 INFO manager: Registered plugin: Red Hat Enterprise Linux guest
 INFO manager: Registered plugin: Darwin guest
 INFO manager: Registered plugin: Linux guest.
 INFO manager: Registered plugin: BSD-based guest
 INFO manager: Registered plugin: Solaris 11 guest.
 INFO manager: Registered plugin: kernel
 INFO global: Loading plugins!
 INFO global: Loading plugin `facter` with default require: `facter`
 INFO global: Loading plugin `vagrant-share` with default require: `vagrant-share`
ERROR global: Failed to load plugin `vagrant-share` with default require. - LoadError: The RubyEncoder loader is not installed. Please visit the http://www.rubyencoder.com/loaders/ RubyEncoder site to download the required loader for 'linux' and unpack it into '/opt/vagrant/embedded/rgloader' directory to run this protected script.
 INFO global: Loading plugin `vagrant-share` with slash require: `vagrant/share`
ERROR global: Plugin loading error: LoadError - cannot load such file -- vagrant/share
ERROR vagrant: Vagrant experienced an error! Details:
ERROR vagrant: #<Vagrant::Errors::PluginLoadError: The plugins failed to load properly. The error message given is
shown below.

cannot load such file -- vagrant/share>
ERROR vagrant: The plugins failed to load properly. The error message given is
shown below.

cannot load such file -- vagrant/share
ERROR vagrant: /opt/vagrant/embedded/gems/gems/vagrant-2.1.2/lib/vagrant.rb:358:in `rescue in <top (required)>'
/opt/vagrant/embedded/gems/gems/vagrant-2.1.2/lib/vagrant.rb:326:in `<top (required)>'
/usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `require'
/usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
/usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:39:in `require'
/opt/vagrant/embedded/gems/gems/vagrant-2.1.2/bin/vagrant:85:in `<main>'
Vagrant failed to initialize at a very early stage:

The plugins failed to load properly. The error message given is
shown below.

cannot load such file -- vagrant/share