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Question: Question: How to resolve this public key issue in Ubuntu?

Neelam Jha
7 days ago

Question: How to resolve this public key issue in Ubuntu?

Hit:12 http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.10 Packages
Fetched 1.496 B in 0s (3.442 B/s)
Reading package lists... Done
W: GPG error: http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.10 Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4ABE1AC7557BEFF9
W: The repository 'http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_16.10 Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.


I recently face the same problem after updates. Try the following to resolve the NO_PUBKEY problem

wget -qO - http://download.owncloud.org/download/repositories/stable/Ubuntu_16.04/Release.key
followed by:
sudo mv Release.key /etc/apt/trusted.gpg.d/owncloud-client.key 


Following line of code help to get rid of this error

sudo wget -qO - http://download.owncloud.org/download/repositories/stable/Ubuntu_16.04/Release.key | sudo apt-key add -