Jessie is not supported

[lbussy]

Raspbian Jessie has been replaced by later versions and is over 3 years since it was deprecated. Supporting Jessie is no longer in the cards, there's just too many variables and no inherent support for the libraries and packages we use here.

This is not a desktop computer, there are zero reasons to be emotionally attached to your installation. The best solution would be to get a new SD card and use the Raspberry Pi Imager to flash the latest version of Raspbian.

If you REALLY must proceed, you have to upgrade Jessie to Buster The following steps may work, however I am not supporting this and you are doing this at your own risk. Chances are all of this will take more time than going to the store, buying an SD card, and flashing a new OS:

grep -rl jessie /etc/apt/ | sudo xargs sed -i 's/jessie/buster/g'
sudo apt-get upgrade --fix-missing -y
sudo dpkg --configure -a
sudo apt update && sudo apt upgrade -y && sudo apt dist-upgrade -y

Reboot your Pi and with luck, you may be able to install BPR.