Help me for fix this eror
[quote]W: GPG error: http://ppa.launchpad.net trusty Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY DF8030F05ED1D082
W: GPG error: http://ppa.launchpad.net trusty Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 52B709720F164EEB
[/quote]
Ubuntu and Manjaro have upgraded to gnupg-2.1 which changed the way in which their gpg keys are formatted, while an update on both systems fixed this issue with their own repositories, third party repositories will need to be done manually.
sudo apt-get update
sudo apt-key adv --<keyserver that is missing> --recv-keys KEY
Yeah if you know what ppas gpg key it is which isn’t imported yet you can simply readd it with the command by Aj 
From the key however I cannot find out which ppa it is really. Maybe going through them one by one and then going to the launchpad site of the ppa their should be instructions how to add the key back.
PS: And btw. these are warnings not errors. Errors would prevent you from installing anything from that repo.
oke, thx bro