Yesterday when i try to add PPA repository for webupd8team, i get an error saying GPG error: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C2518248EEA14886. This happens on lubuntu 17.10 artful aardvark, so how do i fix this issue?
There are two solution for this problem, the first one is by manually add the public key on your computer. The second solution is by installing y-ppa-manager that will take care the missing public key.
Solution 1
Use this special command for adding public key on your computer
Solution 2
Installing y-ppa-manager will also solve the problem
Solution 1
Use this special command for adding public key on your computer
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys [PUBKEY]
sudo apt-get update
where [PUBKEY] is the code that found on the error message right after NO_PUBKEY, for example mine was C2518248EEA14886, you might have different public key.Solution 2
Installing y-ppa-manager will also solve the problem
sudo add-apt-repository ppa:webupd8team/y-ppa-manager
sudo apt-get update
sudo apt-get install y-ppa-manager
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