{"id":455,"date":"2016-02-02T21:27:38","date_gmt":"2016-02-02T13:27:38","guid":{"rendered":"https:\/\/www.techcoil.com\/blog\/?p=455"},"modified":"2018-09-05T23:24:57","modified_gmt":"2018-09-05T15:24:57","slug":"how-to-manually-add-a-public-pgp-key-to-ubuntus-advanced-packaging-tool-apt","status":"publish","type":"post","link":"https:\/\/www.techcoil.com\/blog\/how-to-manually-add-a-public-pgp-key-to-ubuntus-advanced-packaging-tool-apt\/","title":{"rendered":"How to manually add a public PGP key to Ubuntu’s Advanced Packaging Tool (APT)"},"content":{"rendered":"

I was trying to install docker on my Ubuntu server as an initial step to set up a continuous integration server for my Python project. As I was following through the guide provided by docker<\/a>, the following command:<\/p>\n

\r\nsudo apt-key adv --keyserver hkp:\/\/p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D\r\n<\/pre>\n
gave me the following error:<\/p>\n
\r\ngpg: requesting key 2C52609D from hkp server p80.pool.sks-keyservers.net\r\ngpg: keyserver timed out\r\ngpg: keyserver receive failed: keyserver error\r\n<\/pre>\n
I did a ping afterwards and affirmed that my server was not able to reach the key server at p80.pool.sks-keyservers.net<\/code>. <\/p>\n
Since I was not able to add the PGP public key of docker's apt repository, I was not able to continue with the apt-get update<\/code> command further down the guide.<\/p>\n
Looking for the PGP public key of docker's apt repository server at p80.pool.sks-keyservers.net<\/h3>\n
Since I was not able to get the PGP public key automatically with the apt-key command inside my Ubuntu server, I thought about trying to add the key manually on my Ubuntu server. <\/p>\n
I first tried to use my browser on my Windows machine to access the url specified by the --keyserver<\/code> flag of the apt-key<\/code> command. With that, I got to know that there is a web server running at p80.pool.sks-keyservers.net<\/a>.<\/p>\n
My browser returned me a web page with a search box and two buttons - \"Search Key\" and \"Submit Key\". Since I wanted to get the contents of the public PGP key of docker's apt repository, I typed \"docker\" into the search box, hit the \"Search Key\" button and was returned with a list of PGP public keys. And since I had indicated 58118E89F3A912897C070ADBF76221572C52609D<\/code> via the --recv-keys<\/code> flag in the apt-key<\/code> command, I get my browser to find the section that contains the string \"5811\".   <\/p>\n
Indeed, there were some results and my browser highlighted the portion containing the \"5811\". I click on the first link in the section that contains \"Fingerprint=5811 8E89 F3A9 1289 7C07  0ADB F762 2157 2C52 609D\" and was returned with a page that displays the PGP public key that I was looking for.<\/p>\n
Creating a physical file of the public PGP key<\/h3>\n
I then proceeded to create a physical file in my Ubuntu server via the vi<\/code> editor. Note that the display page contains text that was irrelevant for the apt-key command<\/strong>. The PGP public key consists of only the following chunk:<\/p>\n
\r\n-----BEGIN PGP PUBLIC KEY BLOCK-----\r\nVersion: SKS 1.1.5+\r\nComment: Hostname: aes.keys.peer.sh\r\n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\r\nmBYPeyTY5veF49aBJA1gEJOQTvBR8Q==\r\n=Fm3p\r\n-----END PGP PUBLIC KEY BLOCK-----\r\n<\/pre>\n
After I saved the file on my Ubuntu server as 58118E89F3A912897C070ADBF76221572C52609D.key in my current working directory, I proceeded to add it into the APT key store on my Ubuntu server.<\/p>\n
The command to manually add the public PGP key of docker's apt repository at Ubuntu's Advanced Packaging Tool key store<\/h3>\n
With everything in place, I ran the following command:<\/p>\n
\r\nsudo apt-key add 58118E89F3A912897C070ADBF76221572C52609D.key\r\n<\/pre>\n
The command returns the string \"OK\" and I was able to continue with the installation of docker-engine on my Ubuntu server.<\/p>\n\n