I know similar problems have already been added but non of them worked for me.
This is how it started:
I was searching Solution for a problem and I applied this solution from nicktux
I'm new to Linux, and using Ubuntu 18.04. I might have blindly input the solution, but now I have bigger problem.
When I type sudo apt-get update I get:
Reading package lists... Done
W: GPG error: http://archive.canonical.com/ubuntu precise Release: The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5
E: The repository 'http://archive.canonical.com/ubuntu precise Release' 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.
W: GPG error: http://extras.ubuntu.com/ubuntu precise Release: The following signatures were invalid: C47415DFF48C09645B78609416126D3A3E5C1192
E: The repository 'http://extras.ubuntu.com/ubuntu precise Release' 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.
W: GPG error: http://us.archive.ubuntu.com/ubuntu precise-security InRelease: The following signatures were invalid: 630239CC130E1A7FD81A27B140976EAF437D05B5
(Same linkes were repeated.)
I tried sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 630239CC130E1A7FD81A27B140976EAF437D05B5
Nothing worked. I'm very much nervous right now, I hope I dont need to format my Laptop AGAIN for similar kind of problem.
Tell me what should i do?
