See similar: W:GPG Signature validation error: Http://ppa.launchpad.net karmic 920.html ">release: The following signatures cannot be validated because there is no public key: No_pubkey 27f5b2c1b3eac8d9
Workaround:
Download key: GPG--keyserver subkeys.pgp.net--recv ******** Import Key: GPG--export--armor ******** | sudo apt-key add- Note: * Number refers to the eight digits of the key, or all sudo apt update
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