Cambridge eduroam on Ubuntu Server 20.04 (on a raspberry pi)

setup.sh

# First setup Ubuntu 20.04 on your SD card if you haven't already
# I assume by this point you have the Ubuntu SD card still in your laptop/pc
# We need to copy the cat tool to the SD card
# Download the installer here: https://cat.eduroam.org/

# Add the cat installer to the pi SD card; run these commands on your laptop
mkdir /mnt/rpi
# Find the block device for your SD card. Be careful here -- you can mess up your OS if you choose the wrong device!
lsblk # You should see something like 
# mmcblk0     259:0    0   15.4G  0 disk 
# ├─mmcblk0p1 259:1    0   256M 0 part /boot/efi
# ├─mmcblk0p2 259:2    0    2G  0 part 
# Notice the devide size 15.4G is the size of the SD card
# this is how we know it is the SD card and not your laptop's drive
# Pick the bigger partition, in this case it is /dev/mmcblk0p2

sudo mount /dev/<YOUR_SDCARD_PARTITION> /mnt/rpi
sudo cp ~/Downloads/<PATH_TO_EDUROAM_CAT_INSTALLER>.py
sudo umount /mnt/rpi

# Ok now we are done with the SD card, pop it out and put it into the raspberry pi and boot up
# Log into the raspberry pi using login ubuntu:ubuntu
# You may get invalid password error, wait until something about SSH prints to the console, then try again

# Run the cat installer, it's possible the name is different
python3 /eduroam-linux-UoC-eduroam_local_CA.py
# Enter your info as you normally would for a linux PC
# You'll get some error about wpa_supplicant, this is ok
# Create a netplan network config
sudo nano /etc/netplan/49-eduroam.yaml
# Type in the following. Be aware, indentation/spacing matters!
# Fill out password and identity with your own from the Cambridge eduroam token generator website
network:
  wifis:
    wlan0:
      dhcp4: yes
      access-points:
        "eduroam":
          auth:
            key-management: eap
            method: peap
            anonymous-identity: "[email protected]"
            identity: "<YOUR_CRSID_+_DEVICE>"
            password: "<YOUR_REALLY_LONG_PASSWORD>"
            ca-certificate: "/home/ubuntu/.cat_installer/ca.pem" # Created by the cat installer
# Now let's use our netplan config
sudo netplan generate
# There is a BUG in ubuntu 20.04 that is fixed once we update/connect to wifi
# Try netplan apply anyways, you will probably get an error about wlan0.service not existing
# See https://askubuntu.com/questions/1291424/failed-to-start-netplan-wpa-wlan0-sevice-unit-netplan-wpa-wlan0-service-not-fou
sudo netplan apply
# To fix, we must reboot
sudo reboot
# Try again
sudo netplan apply
# You should now have wifi! Verify with a ping
ping google.com

There's a typo: ca-cerificate must be ca-certificate.

Fixed!