Those instructions are outdated. Try this:

Download and install Raspbian Buster for the raspberry Pi
Do the following as root (sudo -s)

Make sure you install is up to date
     apt update
    apt upgrade
    if updates were installed, reboot

Add the dvswitch repository
    wget http://dvswitch.org/buster
    chmod +x buster
    ./buster

Make sure you have added the repository
    apt update
    look for "deb http://dvswitch.org/DVSwitch_Repository hamradio" in the output

Verify programs are now installable

apt install dvswitch-server --dry-run
    any errors reported?

apt install allstar --dry-run
    any errors reported?

Install AllStar first
     apt install allstar
    errors? stop and ask
    reboot
    AllStar working?
    asterisk -r to login to the asterisk cli to check
    use asl-menu to do basic configuration

Install DVSwitch Server
    apt install dvswitch-server
    errors? stop and ask
    logout and back in, or reboot
    run the dvs menu to configure DVSwitch Server
        When asked for the USRP port, take the default (Just hit enter)

Configure AllStar and DVSwitch Server to taste.

Take your time, read the screen. If you get a error, stop, capture the error and past into a e-mail.

Configure DVSwitch Server to taste.
This guide will help you <https://docs.google.com/document/d/1eN50Csr29eAprBu7eKA0Bfa2XUcsXw5iktY1Ey-Qjkg/edit>


Steve