How To Fix “No Public Key Available” Errors for apt-get update on Debian

Author: erics, Posted June 29th, 2016 at 4:45:25pm

root@myHost # apt-get update
Hit http://cloudfront.debian.net wheezy Release.gpg
Hit http://cloudfront.debian.net wheezy-updates Release.gpg
Hit http://cloudfront.debian.net wheezy-backports Release.gpg
Hit http://cloudfront.debian.net wheezy Release
Hit http://cloudfront.debian.net wheezy-updates Release
Hit http://cloudfront.debian.net wheezy-backports Release
Hit http://cloudfront.debian.net wheezy/main Sources
Hit http://cloudfront.debian.net wheezy/main amd64 Packages
Hit http://cloudfront.debian.net wheezy/main Translation-en
Hit http://cloudfront.debian.net wheezy-updates/main Sources
Hit http://security.debian.org wheezy/updates Release.gpg
Get:1 http://cloudfront.debian.net wheezy-updates/main amd64 Packages/DiffIndex [2,488 B]
Get:2 http://cloudfront.debian.net wheezy-updates/main Translation-en/DiffIndex [736 B]
Get:3 http://cloudfront.debian.net wheezy-backports/main Sources/DiffIndex [23.2 kB]
Get:4 http://cloudfront.debian.net wheezy-backports/main amd64 Packages/DiffIndex [13.0 kB]
Get:5 http://cloudfront.debian.net wheezy-backports/main Translation-en/DiffIndex [5,440 B]
Hit http://security.debian.org wheezy/updates Release
Hit http://security.debian.org wheezy/updates/main Sources
Hit http://security.debian.org wheezy/updates/main amd64 Packages
Hit http://security.debian.org wheezy/updates/main Translation-en
Fetched 44.9 kB in 0s (205 kB/s)
Reading package lists... Done
W: There is no public key available for the following key IDs:
7638D0442B90D010
W: There is no public key available for the following key IDs:
7638D0442B90D010
W: There is no public key available for the following key IDs:
7638D0442B90D010
W: There is no public key available for the following key IDs:
9D6D8F6BC857C906

root@myHost # apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 7638D0442B90D010
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.5SvELqBSXw --trustdb-name /etc/apt//trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d//debian-archive-squeeze-automatic.gpg --keyring /etc/apt/trusted.gpg.d//debian-archive-squeeze-stable.gpg --keyring /etc/apt/trusted.gpg.d//debian-archive-wheezy-automatic.gpg --keyring /etc/apt/trusted.gpg.d//debian-archive-wheezy-stable.gpg --keyserver keyserver.ubuntu.com --recv-keys 7638D0442B90D010
gpg: requesting key 2B90D010 from hkp server keyserver.ubuntu.com
gpg: key 2B90D010: public key "Debian Archive Automatic Signing Key (8/jessie) " imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)

root@myHost # apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 9D6D8F6BC857C906
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.l3nc2HhmsV --trustdb-name /etc/apt//trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d//debian-archive-squeeze-automatic.gpg --keyring /etc/apt/trusted.gpg.d//debian-archive-squeeze-stable.gpg --keyring /etc/apt/trusted.gpg.d//debian-archive-wheezy-automatic.gpg --keyring /etc/apt/trusted.gpg.d//debian-archive-wheezy-stable.gpg --keyserver keyserver.ubuntu.com --recv-keys 9D6D8F6BC857C906
gpg: requesting key C857C906 from hkp server keyserver.ubuntu.com
gpg: key C857C906: public key "Debian Security Archive Automatic Signing Key (8/jessie) " imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)

Categories: How-To's, Technology Tags: apt-get, Debian, Error, howto, key, Linux, public, Public Key, tips