Problem installing Heroku with Rails3, Ruby 1.9.2?

The problem turned out to be related to sudo and Ubuntu. RVM depends on the rvm_path environment variable to get started. According to answers to another question sudo does not preserve the PATH variable in some versions of secure Linux.

I don't know if it should ever preserve the rvm_path variable, but in any case, it does not on my version of Ubuntu. So the result of sudo gem install is that the default, RVM-provided version of Ruby is not available during the installation, and the system-default is used. In my case that is version 1.8. The installation appears to succeed, but it is not going to the right gem version.

If 'gem list' doesn't show the Heroku gem then that would seem to be the problem (the error you posted occurs when running a Heroku command without the gem installed).

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