Dist-Upgrade Debian 10 Buster to Debian 12 Bookworm

dist-upgrade-buster-to-bookworm.sh

# Dist-Upgrade Debian 10 Buster to Debian 12 Bookworm
# Debian 10
apt-get -y update
apt-get -y upgrade
apt-get -y full-upgrade

cat > /etc/apt/sources.list <<"EOF"
deb http://deb.debian.org/debian/ bullseye main
deb-src http://deb.debian.org/debian/ bullseye main
deb http://security.debian.org/debian-security stable-security/updates main
deb-src http://security.debian.org/debian-security stable-security/updates main
deb http://deb.debian.org/debian/ bullseye-updates main
deb-src http://deb.debian.org/debian/ bullseye-updates main
EOF

apt-get clean
apt-get -y update

apt-get -y upgrade
apt-get -y full-upgrade

shutdown -r now

# Debian 11

cat > /etc/apt/sources.list <<"EOF"
deb http://deb.debian.org/debian/ bookworm main
deb-src http://deb.debian.org/debian/ bookworm main
deb http://security.debian.org/debian-security stable-security/updates main
deb-src http://security.debian.org/debian-security stable-security/updates main
deb http://deb.debian.org/debian/ bookworm-updates main
deb-src http://deb.debian.org/debian/ bookworm-updates main
EOF

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BDE6D2B9216EC7A8

apt-get clean
apt-get -y update

apt-get -y upgrade
apt-get -y full-upgrade

# issue with libcrypt.so.1
cd /tmp
apt -y download libcrypt1
dpkg-deb -x libcrypt1_1%3a4.4.25-2_amd64.deb .
cp -av lib/x86_64-linux-gnu/* /lib/x86_64-linux-gnu/
apt -y --fix-broken install

apt-get -y upgrade
apt-get -y full-upgrade

apt-get -y auto-remove
shutdown -r now

Can confirm that the upgrades run flawlessly when using the respective bullseye-security and bookworm-security instead of stable-security.
Both libcrypt and keyserver tricks are not needed with the correct security repo links.
Thanks for the gist tho !