[FAILED] DietPi-Update about dietpi

[Bluehmchen]

ok, I have:
tvheadend removed
/etc/apt/sources.list.d/tvheadend.list deleted

Then it worked ;-)

[Joulinar]

can you share full output of

apt update

[Bluehmchen]

 DietPi-Update
─────────────────────────────────────────────────────
 Phase: Checking for available DietPi update

[  OK  ] DietPi-Update | Checking IPv4 network connectivity
[  OK  ] DietPi-Update | Checking DNS resolver
[ INFO ] DietPi-Update | Getting latest version from: https://raw.githubusercontent.com/MichaIng/DietPi/master/.update/version
[  OK  ] DietPi-Update | Got valid latest version: 9.0.2
[  OK  ] DietPi-Update | Update available:
[ INFO ] DietPi-Update | Current version : v8.22.3
[ INFO ] DietPi-Update | Latest version  : v9.0.2

 DietPi-Update
─────────────────────────────────────────────────────
 Phase: Checking for update pre-requirements

[  OK  ] DietPi-Update | DietPi-Userdata validation: /mnt/dietpi_userdata
[  OK  ] DietPi-Update | Free space check: path=/ | available=24301 MiB | required=100 MiB
[ SUB1 ] DietPi-Services > stop
[  OK  ] DietPi-Services | stop : cron
[  OK  ] DietPi-Services | stop : node-red
[  OK  ] DietPi-Services | stop : mosquitto
[  OK  ] DietPi-Services | stop : lighttpd
[  OK  ] DietPi-Services | stop : php7.4-fpm

 DietPi-Update
─────────────────────────────────────────────────────
 Phase: Applying pre-patches

[  OK  ] DietPi-Update | Downloading pre-patches
[  OK  ] DietPi-Update | Applying execute permission
[ INFO ] DietPi-Pre-patches | Reverting now obsolete rpi-eeprom hold
[  OK  ] DietPi-Pre-patches | apt-mark unhold rpi-eeprom
[ INFO ] DietPi-Pre-patches | Migrating from raspberrypi.org to raspberrypi.com
[  OK  ] DietPi-Pre-patches | sed -i s/raspberrypi.org/raspberrypi.com/ /etc/apt/sources.list /boot/dietpi.txt
[  OK  ] DietPi-Pre-patches | sed -i s/raspberrypi.org/raspberrypi.com/ /etc/apt/sources.list.d/dietpi-mosquitto.list /etc/apt/sources.list.d/raspi.list /etc/apt/sources.list.d/tvheadend.list
[  OK  ] DietPi-Pre-patches | mkdir -p ../DietPi-Update/DietPi-master/dietpi
[  OK  ] DietPi-Update | Successfully applied pre-patches

 DietPi-Update
─────────────────────────────────────────────────────
 Phase: Upgrading APT packages

[ INFO ] DietPi-Update | APT update, please wait...
Hit:1 https://deb.debian.org/debian bullseye InRelease
Hit:2 https://deb.debian.org/debian bullseye-updates InRelease
Get:3 https://deb.debian.org/debian-security bullseye-security InRelease [48.4 kB]
Hit:4 https://archive.raspberrypi.com/debian bullseye InRelease
Hit:5 https://repo.mosquitto.org/debian bullseye InRelease
Hit:6 https://deb.debian.org/debian bullseye-backports InRelease
Get:7 http://apt.tvheadend.org/stable raspbian-stretch InRelease
Err:7 http://apt.tvheadend.org/stable raspbian-stretch InRelease
  Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Reading package lists...
E: Failed to fetch http://apt.tvheadend.org/stable/dists/raspbian-stretch/InRelease  Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: The repository 'http://apt.tvheadend.org/stable raspbian-stretch InRelease' is no longer signed.
[FAILED] DietPi-Update | APT update
 - Command: apt-get -y -eany update
root@rp4b:/tmp/DietPi-Update#

[Joulinar]

Yes there was quite an old repository added. I will close this issue for now.

[MichaIng]

While I was writing 😄. Yeah that does not seem to be valid anymore, and it was for Debian 9 Stretch while you use Debian 11 Bullseye. Looks like replacing stretch with bullseye would have worked as well: https://cloudsmith.io/~tvheadend/repos/tvheadend/packages/
There I cannot see the Stretch suite anymore indeed.