How can fix this problem? Hit:1 http://ftp.us.debian.org/debian bullseye InRelease Hit:2 http://deb.debian.org/debian bullseye InRelease Hit:3 http://security.debian.org/debian-security bullseye-security InRelease Get:4 http://deb.debian.org/debian bullseye-updates InRelease [44.1 kB] Hit:5 https://repo.steampowered.com/steam stable InRelease Get:6 http://ppa.launchpad.net/obsproject/obs-studio/ubuntu jammy InRelease [18.1 kB] Err:6 http://ppa.launchpad.net/obsproject/obs-studio/ubuntu jammy InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EFC71127F425E228 Reading package lists... Done W: GPG error: http://ppa.launchpad.net/obsproject/obs-studio/ubuntu jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EFC71127F425E228 E: The repository 'http://ppa.launchpad.net/obsproject/obs-studio/ubuntu jammy 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.
-- With kindest regards, William. ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org ⠈⠳⣄⠀⠀⠀⠀
