Bundler: `initialize': Read-only file system Gemfile.lock

I'm running 'bundle install' in a VM for an application in Ruby 1.9.3, Rails 3.0.20, Bundler 1.6.2, but it gives me this error about the gemfile.lock

I guess that Bundler is using the global gemspec, but I need it to use strictly the versions from the gemfile.

I've tried with the few solutions that I've found, but it's the same. If somebody has any suggestion about. Thanks in advance.