Vagrant: `vagrant up` throws `undefined method 'downcase' for nil:NilClass`

[Lavode]

Vagrant version

› vagrant -v
Vagrant 2.2.4

› ruby -v
ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-linux]

Host operating system

Arch Linux, Kernel 5.0.0

Guest operating system

Debian 9 (via debian/contrib-stretch64 v9.8.0)

Vagrantfile

Vagrant.configure('2') do |config|
  config.vm.box = 'debian/contrib-stretch64'

  config.vm.define 'test' do |cfg|
  end
end

Debug output

https://gist.github.com/Lavode/3f1a260c654146b931839275eb1d670f

Expected behavior

Vagrant should spawn the machine - or provide a useful error message if something goes wrong.

Actual behavior

Exception thrown within net-sftp library.

Steps to reproduce

1. vagrant up

Notes

• Downgrading to vagrant 2.2.3 fixed the issue.

[ssherman]

I'm having the exact same issue since upgrading

[ssherman]

here's debug log of a very single ubuntu vagrant that fails

Vagrant.configure("2") do |config|
  config.vm.box = 'ubuntu/xenial64'
  config.vm.network :private_network, ip: '33.33.33.25'


  config.vm.provider 'virtualbox' do |vb|
    vb.gui = false
    vb.memory = '2048'
  end
end

https://gist.github.com/ssherman/ae3d91bd2e0d04e4f30049f373a5ed97

I downgraded to 2.2.2 and everything works again, so this is definitely a 2.2.3 or 2.2.4 issue.

[chrisroberts]

The origin of the error is quite odd. It's happening while the net-sftp library is loading, however since the sftp upload option was never used (since it required as many manual steps as the required scp updates) we can just remove the loading.

[GabLeRoux]

I had to downgrade to 2.2.2 too because of this issue. Here's how to install 2.2.2 on macos:

cd /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask/
git log master -- Casks/vagrant.rb
# this will give you the hash of the 2.2.2 version
# then just install 
vagrant_hash=51a87e70b29adb6efc9f85c54b1f6c163955c0ae
brew cask install https://raw.githubusercontent.com/caskroom/homebrew-cask/${vagrant_hash}/Casks/vagrant.rb

:v: Thanks

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