Connecting an Raspberry PI to the eduroam or campusroam wifi network results in intermittent connections on Raspbian Buster. Following tutorial explains how to fix this issue, a working internet connection is required!

Add one of the following lines to your '/etc/apt/sources.list' file. Comment out previously existing lines with '#'

deb http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
deb http://raspbian.raspberrypi.org/raspbian/ jessie main contrib non-free rpi
#Note: copy pasting in a terminal using the keyboard shortcuts requires an additional 'shift' --> 'ctrl + shift + c' or 'ctrl + shift + v'

Run 'sudo apt-get update' to complete the previous step.

Full example

sudo nano /etc/apt/sources.list                                                    #Type this command in cmd, followed by 'enter' to open the file in nano
deb http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi    # paste this line using 'ctrl + shift + v'
 
# Use the '#' in front of previous existing lines to comment them out!
# press 'ctrl + o' to save the file!
# press 'ctrl + x' to exit nano!
 
sudo apt-get update                                                                # Once existed, continue with updating aptitude to make the changes take effect.