I'm trying to install Ruby on Ubuntu 16.04. However when I enter to following command to terminal:
$ \curl -sSL https://get.rvm.io | bash -s stable --ruby
I get the following:
Downloading https://github.com/rvm/rvm/archive/1.29.1.tar.gz
Downloading https://github.com/rvm/rvm/releases/download/1.29.1/1.29.1.tar.gz.asc
gpg: Signature made 19 فبر, 2017 EET 10:02:47 م using RSA key ID ********
gpg: Can't check signature: No public key
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/tamer/.rvm/archives/rvm-1.29.1.tgz' - 'https://github.com/rvm/rvm/releases/download/1.29.1/1.29.1.tar.gz.asc'! Try to install GPG v2 and then fetch the public key:
gpg2 --keyserver hkp://keys.gnupg.net --recv-keys ****************************************
or if it fails:
command curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
the key can be compared with:
https://rvm.io/mpapis.asc
https://keybase.io/mpapis
NOTE: GPG version 2.1.17 have a bug which cause failures during fetching keys from remote server. Please downgrade or upgrade to newer version (if available) or use the second method described above.
When I tried any rvm command I got 'command not found'.
I tried requesting https://rvm.io/mpapis.asc through the browser. Then running the following:
$ gpg --import mpapis.asc
but I got the following:
gpg: fatal: can't open `/home/tamer/.gnupg/trustdb.gpg': Permission denied
secmem usage: 1408/1408 bytes in 2/2 blocks of pool 1408/65536
I'm not used to do something that I don't understand, so I stopped their and didn't try sudo.
So how can I install Ruby?
Update
I also tried installing gpg2 using:
$ sudo apt-get install gnupg2 -y
and then I tried
$ gpg2 --keyserver hkp://keys.gnupg.net --recv-keys <key>
and also
$ curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
But still, the same result when I try install rvm with the first command.
n.b. I noticed that I have gpg v1.4.20 and gpg2 v2.1.11
I had the same issue but on Debian and I took an alternate approach. In the error message, it says this: "Try to install GPG v2 and then fetch the public key:" with a
gpg2
command after it. I went and installed gpg2 first and ran the command it told me to and it worked for me.In addition to the previous answers, if you are behind a firewall, the following command might not work for you.
In that case, you can use the following command to get the keys -
sudo apt-key adv --keyserver hkp://keys.gnupg.net:80 --recv-keys <<key>> <<key>>
After trying many ways. I did succeed to install rails as follows:
Where "user" is my username
I am just posting an update solution for it as I faced the same issue in Ubuntu 18.04 while trying to fetch keys for RVM.
The following method is provided by RVM.
If it doesn't work out and you try to install rvm directly, the process will fail and provides three suggestions to receive keys. One of which have a step to receive the keys with gpg2.
Install gpg2 in your system before that.
The command is
But this command too will not work. So here's an alternative. Just replace the gpg from the older command to gpg2 which worked for me.