'How to resolve "gpg: command not found" error during RVM installation?

I have a new mac pro (OS X 10.9.5) that I get to set up from scratch. I want to install RVM and the first thing it says to do is:

Install mpapis public key (might need gpg2 and or sudo)

gpg --keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3

When I tried I got:

gpg --keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3
zsh: command not found: gpg

I've tried to find a good guide on how to overcome this that also looks trustworthy but I've had no luck.

Can someone explain what gpg is, why I dont already have it, and how do I get it the right way.

rubymacoscommand-linervmgnupg


Solution 1:[1]

As the instruction said "might need gpg2"

In mac, you can try install it with homebrew

$ brew install gpg2

Solution 2:[2]

On Mac OSX 10.15, Even after installing gpg, i was getting gpg2 command not found

$ brew install gnupg gnupg2
Warning: gnupg 2.2.23 is already installed and up-to-date
To reinstall 2.2.23, run `brew reinstall gnupg`

$ gpg2 --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
-bash: gpg2: command not found

Instead, this worked for me

$ gpg --keyserver hkp://pool.sks-keyservers.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB

Solution 3:[3]

This worked for me 

$brew install gnupg

Solution 4:[4]

Here are the steps to install RVM.

Step 1: Install gpg or gpg2 (both work)

brew install gpg

Step 2: Install GPG keys used to verify installation package:

gpg --keyserver hkp://pgp.mit.edu --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB

If you encounter problem with the key server above, try a different one.

  • hkp://ipv4.pool.sks-keyservers.net
  • hkp://pgp.mit.edu
  • hkp://keyserver.pgp.com

Step 3: Install RVM

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

Check out the Security page if you still run into problems.

Solution 5:[5]

On my clean macOS 10.15.7, I needed to brew link gnupg && brew unlink gnupg first and then used Ashish's answer to use gpg instead of gpg2. I also had to chown a few directories. before the un/link.

Solution 6:[6]

After installing gpg using:

brew install gnupg2

This solution helped me get the keys to install rvm:

curl -sSL https://rvm.io/mpapis.asc | gpg --import -
curl -sSL https://rvm.io/pkuczynski.asc | gpg --import -

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 rderoldan1
Solution 2 Ashish Pani
Solution 3 Sevle
Solution 4 software_writer
Solution 5 Jeff
Solution 6 A. KUMAR

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