我在 ubuntu 16.04 上安装了 ruby。
$which ruby
/usr/bin/ruby
$ruby -v
ruby 2.3.0p0 (2015-12-25) [x86_64-linux-gnu]
$gem install bundler
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /var/lib/gems/2.3.0 directory.
你首先需要卸载 Ubuntu 安装的 ruby，类似于sudo apt-get remove ruby.
然后使用重新安装红宝石rbenv and 红宝石构建根据他们的文档：
cd $HOME
sudo apt-get update
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libxml2-dev libxslt1-dev libcurl4-openssl-dev libffi-dev
git clone https://github.com/rbenv/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
exec $SHELL
git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
exec $SHELL
rbenv install 2.3.1
rbenv global 2.3.1
ruby -v
最后一步是安装 Bundler：
gem install bundler
rbenv rehash
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