The following signatures couldn't be verified because the public key is not available
I got this error when installing Unifi
root@unifi-01:~# sudo apt-get update
Err:5 https://dl.ubnt.com/unifi/debian stable InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 06E85760C0A52C50 # (1)
Reading package lists... Done
W: GPG error: https://dl.ubnt.com/unifi/debian stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 06E85760C0A52C50
E: The repository 'https://www.ui.com/downloads/unifi/debian stable 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.
- This is the line we need to take note of
Specifically the line
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 06E85760C0A52C50
What's the issue?
The Key was requested, but could not be found on the system.
Solution
Make a note of the keyID we need - This is the section after NO_PUBKEY
Run the below to pull the keys from keyserver.ubuntu.com
Replace the key with the one that has errored for you
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