Error on linux ubuntu 20.04 sudo apt update

Hi guys, forgive a noob trying to install brave on a linux ubuntu 20.04
recently, i did a dual boot for linux on my gateway ne57007b, then i`m trying to install Ros noetic, but first i have tried to install brave. It happens that when use sudo apt update this is what i get:
can someone help me ?

Err:3 https://brave-browser-apt-release.s3.brave.com focal InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 4FE13824E3FFC656
W: GPG error: https://brave-browser-apt-release.s3.brave.com focal InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 4FE13824E3FFC656
E: The repository ‘https://brave-browser-apt-release.s3.brave.com focal 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.

Hello @Chavit00

could you try to run all the command in this link under ubuntu
https://brave-browser.readthedocs.io/en/latest/installing-brave.html#linux

look like you missed this one but

curl -s https://brave-browser-apt-release.s3.brave.com/brave-core.asc | sudo apt-key --keyring /etc/apt/trusted.gpg.d/brave-browser-release.gpg add -

but run all again

hope that help and have a nice day :slight_smile:

not some good updates from here =/

when you trype the sudo apt update
did you got msg telling you to add the key and you choose n

i did not get any option to choose if i would like to add any key.
after using sudo apt update it just update, like automatically =/

someone has your issue in this post

start read from fmarier post