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After becoming root (with su root), ruby automatically falls back to old version which is 1.9.2-p180. After exit from root, the ruby is automatically back to newer version which is 1.9.2-p290.

rvm is installed on the system and p290 was installed with rvm. p180 was installed with apt-get.

Any thoughts? Thanks.

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    If root is using the system ruby then maybe you're initializing root's environment to use rvm? Commented Nov 3, 2011 at 15:18

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Since the root user has a different environment from your regular user, you probably want to use rvmsudo whenever you're using rvm in a root context. This command specifically preserves the version of Ruby currently in use.

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rvmsudo use 1.9.2 --default with error: rvmsudo command not found.
rvmsudo is the same as sudo with the rvm environment preserved. You would do: rvmsudo {command} or in this case rvmsudo rvm use 1.9.2 --default
rvmsudo rvm use 1.9.2 --default did install gem bundler, as regular user (instead as a root). Thanks.
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use .rvmc in root of project directory with content

rvm use ruby-<version>@<gemset>

I have for instance ruby-1.9.2-p290 installed and I created gemset rails 311 for rail 3.1.1, so content of my .rvmc file is 

rvm use ruby-1.9.2-p290@rails311
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first check if rvm is installed system wide or for a particular user. if it is installed for a particular user, you should be using the system ruby when on a root. you can check this by type rvm while on root user

generally rvm is installed for a particular user.

You should update your system ruby if you want to use ruby 1.9.2-p290

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