Error when running build script

[kayakaan02]

When i write ./ci-linux-build.sh to terminal it first seems fine but gets an error:

Hit:1 http://tr.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://tr.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:3 http://tr.archive.ubuntu.com/ubuntu focal-backports InRelease
Ign:4 https://storage.googleapis.com/download.dartlang.org/linux/debian stable InRelease
Hit:5 https://storage.googleapis.com/download.dartlang.org/linux/debian stable Release
Ign:7 http://ppa.launchpad.net/octave/stable/ubuntu focal InRelease     
Hit:8 http://security.ubuntu.com/ubuntu focal-security InRelease        
Hit:9 http://ppa.launchpad.net/pipewire-debian/pipewire-upstream/ubuntu focal InRelease
Err:10 http://ppa.launchpad.net/octave/stable/ubuntu focal Release
  404  Not Found [IP: 185.125.190.52 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/octave/stable/ubuntu focal Release' does not have a Release file.
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.