I installed the Heroku Toolbelt the other day, and it looks like Ruby was a requirement, so the package manager installed it for me. But I was planning to install Ruby through RVM. Will the two Rubys conflict?
RVM allows you to install multiple versions of rubies and manage switching between them without the risk of conflicts between them.
To use any rvm build ruby:
For getting back to system installed ruby:
This is equivalent to
You can also tell rvm to "mount" system ruby, which will allow you creating gemsets with it:
Whenever you install something outside of your package manager (apt) there is the potential for problems. The most common problem would be overwriting a system library used by other applications causing conflicts or breakage. Alternately , libs used by Ruby could be over written when you update a program via apt-get.
There is a nice discussion on the advantages / disadvantages of a package manager here:
In general, use apt (apt-get) if at all possible. If there is a problem with the package in Ubuntu, report a bug, use a ppa, etc.
If all else fails, I advise you compile from source manually and watch for conflicts.