Problem with GPG when installing RVM

[mik01aj]

I just tried the charm on Ubuntu 14.10, but the install fails. Here's the end of the log:

2015-04-25 21:48:36 INFO install + juju-log 'Install RVM'
2015-04-25 21:48:36 INFO juju-log Install RVM
2015-04-25 21:48:36 INFO install + curl -q -L https://get.rvm.io -o /tmp/rvm.install
2015-04-25 21:48:37 INFO install   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
2015-04-25 21:48:37 INFO install                                  Dload  Upload   Total   Spent    Left  Speed
100   184  100   184    0     0    306      0 --:--:-- --:--:-- --:--:--   471
100 22721  100 22721    0     0  15616      0  0:00:01  0:00:01 --:--:-- 70126
2015-04-25 21:48:38 INFO install + chmod +x /tmp/rvm.install
2015-04-25 21:48:38 INFO install + sudo -u discourse -H /tmp/rvm.install stable --auto-dotfiles
2015-04-25 21:48:38 INFO install Turning on auto dotfiles mode.
2015-04-25 21:48:39 INFO install Downloading https://github.com/rvm/rvm/archive/1.26.11.tar.gz
2015-04-25 21:48:41 INFO install Downloading https://github.com/rvm/rvm/releases/download/1.26.11/1.26.11.tar.gz.asc
2015-04-25 21:48:42 INFO install gpg: directory `/home/discourse/.gnupg' created
2015-04-25 21:48:42 INFO install gpg: new configuration file `/home/discourse/.gnupg/gpg.conf' created
2015-04-25 21:48:42 INFO install gpg: WARNING: options in `/home/discourse/.gnupg/gpg.conf' are not yet active during this run
2015-04-25 21:48:42 INFO install gpg: keyring `/home/discourse/.gnupg/pubring.gpg' created
2015-04-25 21:48:42 INFO install gpg: Signature made Mon 30 Mar 2015 05:52:13 PM EDT using RSA key ID BF04FF17
2015-04-25 21:48:42 INFO install gpg: Can't check signature: public key not found
2015-04-25 21:48:42 INFO install Warning, RVM 1.26.0 introduces signed releases and automated check of signatures when GPG software found.
2015-04-25 21:48:42 INFO install Assuming you trust Michal Papis import the mpapis public key (downloading the signatures).
2015-04-25 21:48:42 INFO install
2015-04-25 21:48:42 INFO install GPG signature verification failed for '/home/discourse/.rvm/archives/rvm-1.26.11.tgz' - 'https://github.com/rvm/rvm/releases/download/1.26.11/1.26.11.tar.gz.asc'!
2015-04-25 21:48:42 INFO install try downloading the signatures:
2015-04-25 21:48:42 INFO install
2015-04-25 21:48:42 INFO install     sudo gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
2015-04-25 21:48:42 INFO install
2015-04-25 21:48:42 INFO install or if it fails:
2015-04-25 21:48:42 INFO install
2015-04-25 21:48:42 INFO install     command curl -sSL https://rvm.io/mpapis.asc | sudo gpg --import -
2015-04-25 21:48:42 INFO install
2015-04-25 21:48:42 INFO install the key can be compared with:
2015-04-25 21:48:42 INFO install
2015-04-25 21:48:42 INFO install     https://rvm.io/mpapis.asc
2015-04-25 21:48:42 INFO install     https://keybase.io/mpapis
2015-04-25 21:48:42 INFO install
2015-04-25 21:48:42 ERROR juju.worker.uniter uniter.go:486 hook failed: exit status 2