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curl -sL https://deb.nodesource.com/setup_14.x | sudo bash -
## Installing the NodeSource Node.js 14.x repo...
## Populating apt-get cache...
+ apt-get update
Hit:1 http://archive.ubuntu.csg.uzh.ch/ubuntu bionic InRelease
...
Hit:17 http://ppa.launchpad.net/mozillateam/ppa/ubuntu bionic InRelease
Err:3 http://download.opensuse.org/repositories/home:/manuelschneid3r/xUbuntu_18.04 InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1488EB46E192A257
Err:13 https://deb.torproject.org/torproject.org bionic InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 74A941BA219EC810
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://download.opensuse.org/repositories/home:/manuelschneid3r/xUbuntu_18.04 InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1488EB46E192A257
W: GPG error: https://deb.torproject.org/torproject.org bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 74A941BA219EC810
E: The repository 'https://deb.torproject.org/torproject.org bionic 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.
Error executing command, exiting