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Authored by imirzali on Jan 18 2020, 9:28 AM.
sudo add-apt-repository "deb http://apt.llvm.org/`lsb_release -sc`/ llvm-toolchain-`lsb_release -sc` main"
Hit:1 http://ppa.launchpad.net/system76/pop/ubuntu eoan InRelease
Get:2 http://apt.llvm.org/eoan llvm-toolchain-eoan InRelease [4,216 B]
Hit:3 http://packages.microsoft.com/repos/vscode stable InRelease
Err:2 http://apt.llvm.org/eoan llvm-toolchain-eoan InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 15CF4D18AF4F7421
Hit:4 http://us.archive.ubuntu.com/ubuntu eoan InRelease
Hit:5 http://apt.pop-os.org/proprietary eoan InRelease
Get:6 http://us.archive.ubuntu.com/ubuntu eoan-security InRelease [97.5 kB]
Get:7 http://us.archive.ubuntu.com/ubuntu eoan-updates InRelease [97.5 kB]
Get:8 http://us.archive.ubuntu.com/ubuntu eoan-backports InRelease [88.8 kB]
Reading package lists... Done
W: GPG error: http://apt.llvm.org/eoan llvm-toolchain-eoan InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 15CF4D18AF4F7421
E: The repository 'http://apt.llvm.org/eoan llvm-toolchain-eoan InRelease' 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.