rvm 설치 문제

Question

Ubuntu 14.04에 rvm을 설치하려고 합니다.

$ \curl -L https://get.rvm.io | bash -s stable --ruby
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   184  100   184    0     0    843      0 --:--:-- --:--:-- --:--:--   847
100 22817  100 22817    0     0  47846      0 --:--:-- --:--:-- --:--:-- 47846
Downloading https://github.com/wayneeseguin/rvm/archive/1.26.10.tar.gz
Downloading https://github.com/wayneeseguin/rvm/releases/download/1.26.10/1.26.10.tar.gz.asc
gpg: Signature made Mon 02 Feb 2015 11:09:00 AM EST using RSA key ID BF04FF17
gpg: Can't check signature: public key not found
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/t/.rvm/archives/rvm-1.26.10.tgz' - 'https://github.com/wayneeseguin/rvm/releases/download/1.26.10/1.26.10.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:

    https://rvm.io/mpapis.asc
    https://keybase.io/mpapis

그런 다음 제안된 내용을 실행합니다.

gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3

그런 다음 다시 실행

\curl -L https://get.rvm.io | bash -s stable --ruby

이제 작동하는 것 같습니다.

1. gpg문제는 무엇을 의미하며, 문제를 해결하는 명령을 실행하면 어떻게 됩니까 ?

2. 왜 앞에 \가 있지 curl?

감사해요!