Raspberry Pi - Upgrade bulleys to trixie

First upgrade to bookworm

sudo apt update
sudo apt full-upgrade
sudo sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list
sudo sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list.d/*.list
sudo apt update
sudo apt full-upgrade
sudo reboot

You may get this error

raspi-firmware or sense-hat

Upgrade to trixie

sudo apt update
sudo apt full-upgrade
sudo sed -i 's/bookworm/trixie/g' /etc/apt/sources.list
sudo sed -i 's/bookworm/trixie/g' /etc/apt/sources.list.d/*.list
sudo apt update
sudo apt full-upgrade
sudo reboot

 If you get stuck with another error like this

Errors were encountered while processing:      /var/cache/apt/archives/lxpanel_0.11.1-1_arm64.deb

Run the following

sudo dpkg --purge --force-depends lxplug-cpu
sudo apt --fix-broken install