Installing ruby on rails on portable ubuntu on my work pc with the exact same instructions as I used at home. but for some reason I can't start the webserver.

it says

rails requires rubygems >= 1.3.2

Gems tells me there's no updates to be had. There's a solution on the ubuntu instruction page.

sudo gem install rubygems-update

sudo update_rubygems.

unfortunately after successful completion of the first line, it has no idea who or what update_rubygems is.

WAIT

this time I used gems instead of apt-get. trying to do it the 'proper' way. hhmph.