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I want to install Veyon on the RPi4. I have read about Debian packages and the instructions.

I had a look in my /etc/apt/sources.list and it had an entry for buster, so I added the line for Veyon Buster:

deb http://ppa.launchpad.net/veyon/stable/ubuntu bionic main

I then tried to run the command

sudo add-apt-repository ppa:veyon/stable

but there is no add-apt-repository on my Raspberry and I could not install that with sudo apt install.

Using only

sudo apt-get update

does not work, because there are keys missing, so the source is not trusted. What am I missing?

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Not sure I understand what you're trying to do, but here's the answer to your question:

It seems you may be looking in the wrong place. If you want to learn if a package is available on your RPi, try this:

apt-cache search xxxx

In your case, 'xxxx' is veyon, and so on my Pi w/ buster:

$ apt-cache search veyon
libveyon-core - Computer Monitoring and Classroom Management Software - libraries
veyon-configurator - Computer Monitoring and Classroom Management Software - configurator
veyon-master - Computer Monitoring and Classroom Management Software - master
veyon-plugins - Computer Monitoring and Classroom Management Software - plugins
veyon-service - Computer Monitoring and Classroom Management Software - client service

Best practice for installation of a new package is as follows:

sudo apt-get update
sudo apt-get upgrade
sudo reboot              # to be sure any kernel or firmware upgrades are running
sudo apt-get install veyon-xxx  # whichever ones you need
| improve this answer | |
  • Darn! So that change in /etc/apt/sources.list would not even have been required, because Veyon is already in the default RPi repositories? – Thomas Weller May 14 at 7:21
  • @ThomasWeller: Not only is it not required, it will (probably) break your system if you don't remove it. Remember: RPi uses a RISC/ARM processor, and code compiled for Intel/AMD processors is incompatible. – Seamus May 14 at 7:45

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