How to fix Expired GPG Key error in antiX Linux

6.7.2026: Old instruction does not work any more, so this is a new.

1. Download and install antix-archive-keyring_20026.03.18_all.deb

wget -c http://mirror.accum.se/mirror/mxlinux.org/packages/antix/bookworm/pool/main/a/antix-archive-keyring/antix-archive-keyring_20026.03.18_all.deb

sudo dpkg -i antix-archive-keyring_20026.03.18_all.deb

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2. Set correct /etc/apt/sources.list.d/antix.list and debian.list files. Which are in antiX 23

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antiX.list

# Use with Debian Bookworm repositories.
deb [signed-by=/etc/apt/keyrings/antix-archive-keyring.gpg] http://mirror.accum.se/mirror/mxlinux.org/packages/antix/bookworm bookworm main nonfree nosystemd
#deb-src http://mirror.accum.se/mirror/mxlinux.org/packages/antix/bookworm bookworm main nosystemd nonfree

# Use with Debian Testing/'rolling' repositories.
#deb http://mirror.accum.se/mirror/mxlinux.org/packages/antix/testing testing main nosystemd nonfree
#deb-src http://mirror.accum.se/mirror/mxlinux.org/packages/antix/testing testing main nosystemd nonfree

# Use with Debian Sid repositories.
#deb http://mirror.accum.se/mirror/mxlinux.org/packages/antix/sid sid main nosystemd nonfree
#deb-src http://mirror.accum.se/mirror/mxlinux.org/packages/antix/sid sid main nosystemd nonfree

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debian.list

# Debian Bookworm/Stable
deb http://ftp.dk.debian.org/debian/ bookworm main contrib non-free non-free-firmware
deb http://security.debian.org/ bookworm-security main contrib non-free non-free-firmware

# Multimedia Stable!
# ONLY use to install libdvdcss2 and codecs.
# deb http://www.deb-multimedia.org bookworm main non-free

# Debian Testing.
# Testing enabled for 'rolling' release.
# deb http://ftp.dk.debian.org/debian/ testing main contrib non-free non-free-firmware
# deb http://security.debian.org testing-security main contrib non-free non-free-firmware
#deb-src http://ftp.dk.debian.org/debian/ testing main contrib non-free non-free-firmware

# Multimedia Testing!
# Only use to install libdvdcss2 and codecs.
#deb http://www.deb-multimedia.org testing main non-free

###### Debian Unstable/Sid##########
###### Use at your own risk! ########
#deb http://ftp.dk.debian.org/debian/ unstable main contrib non-free non-free-firmware
# Multimedia Unstable/Sid!
# Only use to install libdvdcss2 and codecs.
#deb http://www.deb-multimedia.org sid main non-free

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debian-stable-updates.list

# Debian Bookworm Updates
deb http://ftp.dk.debian.org/debian/ bookworm-updates main contrib non-free non-free-firmware