ta-

Hi For years I run Armbian on a cubieboard2 in order to have a pi-hole in my network. Now I want to update it to a newer version (the current nickname seems to be focal) and run into problems. I wonder whether someone can lend me a hand. ta-@cubieboard2:~$ sudo apt update [sudo] password for ta-: Hit:1 http://ports.ubuntu.com focal InRelease Hit:2 http://ports.ubuntu.com focal-security InRelease Get:3 http://ports.ubuntu.com focal-updates InRelease [114 kB] Hit:4 http://ports.ubuntu.com focal-backports InRelease Ign:5 http://fi.mirror.armbian.de/apt focal InRelease Err:6 http://fi.mirror.armbian.de/apt focal Release 404 Not Found [IP: 2a01:4f9:3b:4943::2 80] Reading package lists... Done E: The repository 'http://apt.armbian.com focal Release' no longer has 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. I don't know enough about this error message to fix it. I understand a certain mirror doesn't exist anymore but that's where my understanding ends. Can I add to my sources.list perhaps to fix this? Currently it looks like this ta-@cubieboard2:~$ cat /etc/apt/sources.list deb http://ports.ubuntu.com/ focal main restricted universe multiverse #deb-src http://ports.ubuntu.com/ focal main restricted universe multiverse deb http://ports.ubuntu.com/ focal-security main restricted universe multiverse #deb-src http://ports.ubuntu.com/ focal-security main restricted universe multiverse deb http://ports.ubuntu.com/ focal-updates main restricted universe multiverse #deb-src http://ports.ubuntu.com/ focal-updates main restricted universe multiverse deb http://ports.ubuntu.com/ focal-backports main restricted universe multiverse #deb-src http://ports.ubuntu.com/ focal-backports main restricted universe multiverse Thanks!