Repositories update error

[MrBaffer20001]

When I try to update the repositories I get an error...
W: GPG error: https://brave-browser-apt-nightly.s3.brave.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0B31DBA06A8A26F9
E: The repository 'https://brave-browser-apt-nightly.s3.brave.com stable 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.
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'https://brave-browser-apt-release.s3.brave.com stable InRelease' doesn't support architecture 'i386'

 

[Brickwizard]

I386 is 32 bit, which distribution are you running

 

[Lord Boltar]

How to fix missing public key
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys COPIED-NUMBER-HERE

So in your case that would be

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 0B31DBA06A8A26F9

 

[arochester]

This looks like Debian and not Ubuntu...
The signing key needs to be saved into a keyring?

Installing Brave on Linux | Brave Browser

The Brave browser is a fast, private and secure web browser for PC, Mac and mobile. Download now to enjoy a faster ad-free browsing experience that saves data and battery life by blocking tracking software.

brave.com

 

[Condobloke]

G'day MrBuffer, Welcome to Linux.org

Lord Boltar's answer will likely fix your problem

Did you recently install Brave ?

 

[Lord Boltar]

This looks like Debian and not Ubuntu...
The signing key needs to be saved into a keyring?

Installing Brave on Linux | Brave Browser

The Brave browser is a fast, private and secure web browser for PC, Mac and mobile. Download now to enjoy a faster ad-free browsing experience that saves data and battery life by blocking tracking software.

brave.com

I use that for both in Debian - then I just copy the key to /etc/apt/trusted.gpg.d/ - then run sudo apt update

 

[KGIII]

Why are you running the nightly build?

 

[wizardfromoz]

Yes, looks like Debian.

If so, then from @arochester 's link and for nightly

Nightly Channel Installation​

Debian, Ubuntu, Mint​

sudo apt install curl

sudo curl -fsSLo /usr/share/keyrings/brave-browser-nightly-archive-keyring.gpg https://brave-browser-apt-nightly.s3.brave.com/brave-browser-nightly-archive-keyring.gpg

echo "deb [signed-by=/usr/share/keyrings/brave-browser-nightly-archive-keyring.gpg] https://brave-browser-apt-nightly.s3.brave.com/ stable main"|sudo tee /etc/apt/sources.list.d/brave-browser-nightly.list

sudo apt update

sudo apt install brave-browser-nightly

Cheers

Wizard

 

[eosdev]

How to fix missing public key
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys COPIED-NUMBER-HERE

So in your case that would be

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 0B31DBA06A8A26F9

This solved my issue, thank you!