====== Raspbian (Buster) Eduroam / Campusroam(-2.4) WiFi 'bug' ======
===== Intro =====
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!

===== Solution: Downgrading wpasupplicant =====
==== 1) Setting sources.list file: ====
Add **one** of the following lines to your **'/etc/apt/sources.list'** file. Comment out previously existing lines with '#'
<code bash Pick 1 out of two lines!>
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'
</code>

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

__**Full example**__
<code bash 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. 
</code>

==== 2) Checking and installing the available 'wpasupplicant' versions: ====
The previous step should have downgraded the 'wpasupplicant' versions available for installation on your system. Run a check using **'apt-cache policy wpasupplicant'**
\\ Follow the previous step with **'sudo apt-get install <package of choice>'**
<code bash Type: >
apt-cache policy wpasupplicant                                                     # this prints the wpasupplicant versions available on your system. 

# Select one of following versions (stretch or jessie). Selection is based on your config inside /etc/apt/sources.list
# Note that the version numbers could be different on your system! Check the apt-cache policy wpasupplicant output for certainty! 
sudo apt-get install sudo apt-get install wpasupplicant=2:2.4-1+deb9u7 -t stretch  # package of choice is printed by the previous command.
sudo apt-get install wpasupplicant=2.3.1+deb8u10 -t jessie                         # package of choice is printed by the previous command.
</code>

{{:public:linux:eduroamcampusroam:apt-cache_policy_wpasupplicant.png?600|Example,the print-screen was taken after downgrading wpasupplicants on my system!}}
\\ //Note: The print-screen was taken after downgrading wpasupplicants on my system!//


==== 3) Set the wifi configuration correctly: ====
Open up the **/etc/wpa_supplicant/wpa_supplicant.conf** file using nano. 
<code bash>
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
# press 'ctrl + o' to save the file!
# press 'ctrl + x' to exit nano!
</code>

Add additional lines to the file:
<code bash | wpa_supplicant.conf>
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=BE

network={
         ssid="campusroam-2.4"
         scan_ssid=1
         mode=0
         proto=RSN
         key_mgmt=WPA-EAP
         eap=PEAP
         identity="u******@kuleuven.be"
         ca_cert="/usr/share/ca_certificates/mozilla/DigiCert_Assured_ID_Root_CA.crt"
         password="*******" # Ask google if you want this encrypted.
         phase1="peapleabel=auto peapver=auto"
         pahse2="auth=MSCHAPV2"
}
</code>

<code>
# press 'ctrl + o' to save the file!
# press 'ctrl + x' to exit nano!
</code>

__**Reboot your system!**__

==== 4) Optionally - Change DNS server: ====
First make sure you have network connection using **ip a**. 
\\ Secondly if you're connected, check your current DNS settings using **'cat /etc/resolv.conf'**

<code bash>
ip a
cat /etc/resolv.conf
</code>

Use nano to open the **'/etc/dhcpcd.conf'** file
add the following to it: **'static domain_name_server=8.8.8.8 134.58.126.3'**

<code bash>
sudo nano /etc/dhcpcd.conf
static domain_name_server=8.8.8.8 134.58.126.3  # change the secondary '134.58.126.3' ip address to one of the addresses shown inside your '/etc/resolv.conf' file. 
</code>

__**Reboot your system!**__