dwz from home:bk_lf project

For xUbuntu 18.04 run the following:

Keep in mind that the owner of the key may distribute updates, packages and repositories that your system will trust (more information).

echo 'deb http://download.opensuse.org/repositories/home:/bk_lf/xUbuntu_18.04/ /' | sudo tee /etc/apt/sources.list.d/home:bk_lf.list
curl -fsSL https://download.opensuse.org/repositories/home:bk_lf/xUbuntu_18.04/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/home_bk_lf.gpg > /dev/null
sudo apt update
sudo apt install dwz