我正在使用安装了capistrano的ubuntu流浪者盒子来开发应用程序。当我尝试部署时，出现以下错误：
/usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:152:in `require': no such file to load -- capistrano/ext/multistage (LoadError)
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:152:in `require'
from ./config/deploy.rb:3:in `load'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:172:in `load_from_file'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:89:in `load'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:86:in `load'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:86:in `each'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:86:in `load'
from Capfile:4:in `load'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:172:in `load_from_file'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:89:in `load'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:86:in `load'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:86:in `each'
from /usr/lib/ruby/vendor_ruby/capistrano/configuration/loading.rb:86:in `load'
from /usr/lib/ruby/vendor_ruby/capistrano/cli/execute.rb:65:in `load_recipes'
from /usr/lib/ruby/vendor_ruby/capistrano/cli/execute.rb:65:in `each'
from /usr/lib/ruby/vendor_ruby/capistrano/cli/execute.rb:65:in `load_recipes'
from /usr/lib/ruby/vendor_ruby/capistrano/cli/execute.rb:31:in `execute!'
from /usr/lib/ruby/vendor_ruby/capistrano/cli/execute.rb:14:in `execute'
from /usr/bin/cap:4
如谷歌建议我尝试重新安装capistrano，但是由于依赖关系而失败（net-ssh需要ruby> = 2.0），所以我安装了net-ssh v2.9.2
sudo gem install net-ssh -v 2.9.2
Fetching: net-ssh-2.9.2.gem (100%)
Successfully installed net-ssh-2.9.2
1 gem installed
但是现在下一个依赖项错误发生了。如何重新安装capistrano？我需要较新版本的ruby（apt-get install ruby告诉我已经安装了最新版本）吗？还是此错误的原因完全不同？
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我来说两句