Issue on build docker container

[Pierpa]

Hello,
I've got an issue during the build of docker container:
root@ubuntu/test/metatrader5-linux-django-docker# docker-compose build --no-cache
traefik uses an image, skipping
postgres uses an image, skipping
redis uses an image, skipping
cadvisor uses an image, skipping
node-exporter uses an image, skipping
uncomplicated-alert-receiver uses an image, skipping
alertmanager uses an image, skipping
prometheus uses an image, skipping
grafana uses an image, skipping
loki uses an image, skipping
promtail uses an image, skipping
Building mt5
Sending build context to Docker daemon 80.38kB
Step 1/19 : FROM ghcr.io/linuxserver/baseimage-kasmvnc:debianbullseye-8446af38-ls104 AS base
---> 1a356b62dd2f
Step 2/19 : ENV TITLE=MetaTrader
---> Running in 335da38cab90
Removing intermediate container 335da38cab90
---> c45c40281b28
Step 3/19 : ENV WINEARCH=win64
---> Running in 678e3378532b
Removing intermediate container 678e3378532b
---> 6724a8546182
Step 4/19 : ENV WINEPREFIX="/config/.wine"
---> Running in e71592b40634
Removing intermediate container e71592b40634
---> f026183be0b0
Step 5/19 : ENV DISPLAY=:0
---> Running in 25a50f09b30a
Removing intermediate container 25a50f09b30a
---> 85fc2c581732
Step 6/19 : RUN mkdir -p /config/.wine && chown -R abc:abc /config/.wine && chmod -R 755 /config/.wine
---> Running in 8398d1bc5a5c
Removing intermediate container 8398d1bc5a5c
---> 55f6e5ccfbab
Step 7/19 : RUN apt-get update && apt-get upgrade -y
---> Running in 4c112c6e62c4
Get:1 http://deb.debian.org/debian bullseye InRelease [75.1 kB]
Get:2 http://deb.debian.org/debian bullseye-updates InRelease [44.0 kB]
Get:3 http://security.debian.org/debian-security bullseye-security InRelease [27.1 kB]
Ign:4 http://deb.debian.org/debian bullseye-backports InRelease
Err:5 http://deb.debian.org/debian bullseye-backports Release
404 Not Found [IP: 146.75.62.132 80]
Get:6 https://deb.nodesource.com/node_18.x bullseye InRelease [4,586 B]
Get:7 https://download.docker.com/linux/debian bullseye InRelease [43.3 kB]
Get:8 http://deb.debian.org/debian bullseye/contrib Sources [51.5 kB]
Get:9 http://deb.debian.org/debian bullseye/non-free Sources [98.1 kB]
Get:10 http://deb.debian.org/debian bullseye/main Sources [11.4 MB]
Get:11 http://deb.debian.org/debian bullseye/non-free amd64 Packages [121 kB]
Get:12 http://deb.debian.org/debian bullseye/contrib amd64 Packages [61.0 kB]
Get:13 http://deb.debian.org/debian bullseye/main amd64 Packages [11.1 MB]
Get:14 http://deb.debian.org/debian bullseye-updates/main Sources [7,908 B]
Get:15 http://deb.debian.org/debian bullseye-updates/main amd64 Packages [18.8 kB]
Get:16 http://security.debian.org/debian-security bullseye-security/contrib Sources [1,046 B]
Get:17 http://security.debian.org/debian-security bullseye-security/main Sources [364 kB]
Get:18 http://security.debian.org/debian-security bullseye-security/non-free Sources [1,273 B]
Get:19 http://security.debian.org/debian-security bullseye-security/contrib amd64 Packages [2,996 B]
Get:20 http://security.debian.org/debian-security bullseye-security/non-free amd64 Packages [1,117 B]
Get:21 http://security.debian.org/debian-security bullseye-security/main amd64 Packages [515 kB]
Get:22 https://deb.nodesource.com/node_18.x bullseye/main amd64 Packages [776 B]
Get:23 https://download.docker.com/linux/debian bullseye/stable amd64 Packages [73.0 kB]
Reading package lists...
E: The repository 'http://deb.debian.org/debian bullseye-backports Release' does not have a Release file.
The command '/bin/sh -c apt-get update && apt-get upgrade -y' returned a non-zero code: 100
ERROR: Service 'mt5' failed to build : Build failed