Can't install Ruby on Rails with RVM on Ubuntu 13.04

Question

I am trying to install RVM on my Ubuntu machine.

I have used curl to get RVM, but some RVM commands (install, requirements) throw this apt-get error:

Answer 1

For people that know nothing about Linux or are newbies to Linux (like me) those are steps how to solve this (explanation, that was given above, was not that clear for me :) ).

1. Go to Package Manager, tab Settings, Preferences
2. In the opened window you'll see Other Software tab or something like that with links to servers. In my case one of these (it's mentioned in the error log that was produced by rvm) was causing errors and was not available (404 errors). I just unchecked it.
3. run rmv dependencies only when you closed Package Manager, or you'll get error saying that something is locked at the moment.

And everything now is installed successfully! :)