Easy scripts to update a Debian.

First step – update from Debian 10 to 11

apt-get -y update
apt-get -y upgrade --without-new-pkgs
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 bullseye-security/updates main
deb-src http://security.debian.org/debian-security bullseye-security/updates main
deb http://deb.debian.org/debian/ bullseye-updates main
deb-src http://deb.debian.org/debian/ bullseye-updates main
EOF

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 605C66F00D6C9793 6ED0E7B82643E131 0E98404D386FA1D9

apt-get clean
apt-get -y update

apt-get -y upgrade --without-new-pkgs
apt-get -y full-upgrade
shutdown -r now

Second step update Debian from 11 to 12

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 bookworm-security main
deb-src http://security.debian.org/debian-security bookworm-security 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 --without-new-pkgs
apt-get -y full-upgrade

# issue with libcrypt.so.1
cd /tmp
apt -y download libcrypt1
dpkg-deb -x libcrypt1_*.deb .
cp -av lib/x86_64-linux-gnu/* /lib/x86_64-linux-gnu/
apt -y --fix-broken install

apt-get -y upgrade --without-new-pkgs
apt-get -y full-upgrade

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

TIPS

Fix the error “Debian – Unable to shutdown/reboot my Debian (“bash: shutdown: command not found”)”

echo '
export PATH="$PATH:/usr/sbin"
' | tee -a /root/.bashrc

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