tentei instalar de acordo com o exercício tando utilizando o sudo com sem o sudo no ubuntu 15.10 e apresentou este erro:
$ sudo \curl -sSL https://get.rvm.io | bash -s stable --rails [sudo] senha para alcimar: Downloading https://github.com/rvm/rvm/archive/1.26.11.tar.gz Downloading https://github.com/rvm/rvm/releases/download/1.26.11/1.26.11.tar.gz.asc gpg: Assinatura feita Seg 30 Mar 2015 18:52:13 BRT usando RSA chave ID BF04FF17 gpg: Impossível verificar assinatura: chave pública não encontrada Warning, RVM 1.26.0 introduces signed releases and automated check of signatures when GPG software found. Assuming you trust Michal Papis import the mpapis public key (downloading the signatures).
GPG signature verification failed for '/home/alcimar/.rvm/archives/rvm-1.26.11.tgz' - 'https://github.com/rvm/rvm/releases/download/1.26.11/1.26.11.tar.gz.asc'! try downloading the signatures:
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
or if it fails:
command curl -sSL https://rvm.io/mpapis.asc | gpg --import -
the key can be compared with: