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My system is Ubuntu 16.04.

When I ran 

apt-get update

it failed with following error：

the following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1C52189C923F6CA9

so I ran:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1C52189C923F6CA9

to get the pubkey but failed again with the following error:

keyserver.ubuntu.com
--recv-keys
1C52189C923F6CA9
gpg: requesting key 923F6CA9 from hkp server keyserver.ubuntu.com
gpgkeys: key 1C52189C923F6CA9 can't be retrieved
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
gpg: keyserver communications error: keyserver helper general error
gpg: keyserver communications error: unknown pubkey algorithm
gpg: keyserver receive failed: unknown pubkey algorithm

I still don't know how to solve it after searching and trying many times.

njuyuanrui
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1 Answers1

2

I've faced with same problem, and I've fix this by check this :

  • If your internet connection is behind some Authentication gate or proxy

    Make sure that you have login to the authentication gate, or export the proxy so the terminal can communicate to the public key server

UPDATE : Well, the authentication gate is depend on your internet provider. It is used to be a website login page.

Or, you can enter this to use proxy in your terminal :

export http_proxy='http://<proxyserveraddress>:<portnumber>'    
export https_proxy='https://<proxyserveraddress>:<portnumber>'
Hari Setiawan
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