Crystal: Not able to install crystal on ubuntu 18.04

[gustavomf-cit]

There is something wrong with pgp key

root@localhost:~# curl https://dist.crystal-lang.org/apt/setup.sh | bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   200  100   200    0     0    187      0  0:00:01  0:00:01 --:--:--   187
Executing: /tmp/apt-key-gpghome.zqh9KjVlRg/gpg.1.sh --keyserver keys.gnupg.net --recv-keys 09617FD37CC06B54
gpg: keyserver receive failed: Server indicated a failure
Hit:1 http://ubuntu.c3sl.ufpr.br/ubuntu bionic InRelease                                                                                     
Hit:2 http://ubuntu.c3sl.ufpr.br/ubuntu bionic-updates InRelease                                                                             
Hit:3 http://ubuntu.c3sl.ufpr.br/ubuntu bionic-backports InRelease                                                                           
Hit:4 http://ubuntu.c3sl.ufpr.br/ubuntu bionic-security InRelease                                                                            
Ign:5 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                 
Hit:6 http://dl.google.com/linux/chrome/deb stable Release                                                                                   
Hit:9 https://packages.microsoft.com/repos/vscode stable InRelease                                                                           
Get:10 https://dist.crystal-lang.org/apt crystal InRelease [2.478 B]
Err:10 https://dist.crystal-lang.org/apt crystal InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 09617FD37CC06B54
Ign:7 http://packages.erlang-solutions.com/debian bionic InRelease
Hit:11 http://packages.erlang-solutions.com/debian bionic Release
Reading package lists... Done
W: GPG error: https://dist.crystal-lang.org/apt crystal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 09617FD37CC06B54
E: The repository 'https://dist.crystal-lang.org/apt crystal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
root@localhost:~# 

apt-key adv --keyserver keys.gnupg.net --recv-keys 09617FD37CC06B54
Executing: /tmp/apt-key-gpghome.8b8lIFlW2C/gpg.1.sh --keyserver keys.gnupg.net --recv-keys 09617FD37CC06B54
gpg: keyserver receive failed: Server indicated a failure

[gustavomf-cit]

disregard this problem, it was a networking issue ... the solution is to use hkp protocol using port 80

apt-key adv --keyserver hkp://keys.gnupg.net:80 --recv-keys 09617FD37CC06B54

[oprypin]

I think at least one more person had the same problem, so maybe it's worth checking out. Though I was unable to reproduce this.

[RX14]

The problem is with the keys.gnupg.net keyservers. They're incredibly flaky. We should switch away from relying on keyservers at all.