Cannot gem install

[danielatdattrixdotcom]

Description

Using gem to install any item fails with an ArgumentError

Steps to reproduce

1. rvm get master
2. rvm install 2.6 (also tried 2.4 and 2.1)
3. rvm use 2.6
4. gem install capistrano (or rake, or anything)

Expected behavior

I would expect it to install.

Actual behavior

• gem install capistrano

Debug mode:

• gem --debug install capistrano

Environment info

ruby-2.6.0:

system:
uname: "Linux hostname 4.17.5-gentoo #1 SMP Tue Jul 10 12:29:40 PDT 2018 x86_64 AMD Ryzen 7 2700X Eight-Core Processor AuthenticAMD GNU/Linux"
name: "Gentoo"
version: "base-2.6"
architecture: "x86_64"
bash: "/bin/bash => GNU bash, version 4.4.23(1)-release (x86_64-pc-linux-gnu)"
zsh: " => not installed"
remote_path: "gentoo/base-2.6/x86_64"

rvm:
version: "1.29.7-next (master)"
updated: "5 minutes 1 second ago"
path: "/home/linux_user/.rvm"
autolibs: "[4] Allow RVM to use package manager if found, install missing dependencies, install package manager (only OS X)."

ruby:
interpreter: "ruby"
version: "2.6.0p0"
date: "2018-12-25"
platform: "x86_64-linux"
patchlevel: "2018-12-25 revision 66547"
full_version: "ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-linux]"

homes:
gem: "/home/linux_user/.rvm/gems/ruby-2.6.0"
ruby: "/home/linux_user/.rvm/rubies/ruby-2.6.0"

binaries:
ruby: "/home/linux_user/.rvm/rubies/ruby-2.6.0/bin/ruby"
irb: "/home/linux_user/.rvm/rubies/ruby-2.6.0/bin/irb"
gem: "/home/linux_user/.rvm/rubies/ruby-2.6.0/bin/gem"
rake: "/home/linux_user/.rvm/rubies/ruby-2.6.0/bin/rake"

environment:
PATH: "/home/linux_user/.rvm/gems/ruby-2.6.0/bin:/home/linux_user/.rvm/gems/ruby-2.6.0@global/bin:/home/linux_user/.rvm/rubies/ruby-2.6.0/bin:/home/linux_user/.rvm/bin:/usr/lib/llvm/6/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/bin:/opt/aws/ec2-api-tools/bin:/home/linux_user/bin:/home/linux_user/node_modules/.bin:/opt/aws/ec2-api-tools/bin:/home/linux_user/bin:/home/linux_user/node_modules/.bin"
GEM_HOME: "/home/linux_user/.rvm/gems/ruby-2.6.0"
GEM_PATH: "/home/linux_user/.rvm/gems/ruby-2.6.0:/home/linux_user/.rvm/gems/ruby-2.6.0@global"
MY_RUBY_HOME: "/home/linux_user/.rvm/rubies/ruby-2.6.0"
IRBRC: "/home/linux_user/.rvm/rubies/ruby-2.6.0/.irbrc"
RUBYOPT: ""
gemset: ""