Answer by Mijo for Error while installing ruby using rvm

I faced the same problem while executing the command

curl -L https://get.rvm.io | bash -s stable --autolibs=3 --rails

It appeared to be that I was using the command as not a previleged user. So, using

sudo curl -L https://get.rvm.io | bash -s stable --autolibs=3 --rails

solved the problem