Installing rubygems fails in Ubuntu 14.04 Trusty

[nicwaller]

In Ubuntu 14.04 Trusty, Chef exits with a fatal error when trying to converge this cookbook.

Error executing action `upgrade` on resource 'apt_package[rubygems]'
rubygems has no candidate in the apt-cache
FATAL: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully

In Ubuntu 14.04 the apt package was renamed to rubygems-integration. But it's unclear to me whether the rubygems package is still needed; some sources suggest that starting with Ruby 1.9 it isn't necessary to install rubygems-integration.