After wrestling for a while trying to get CrowdStrike's falcon sensor app running properly in Ubuntu, we found that the online documentation is incomplete. A round trip to their support team got us this PDF (Falcon Sensor for Linux Deployment Guide Documentation Support _ Falcon), which gave us the information we needed:
Install; your version may be different, the package is available on your portal.
sudo dpkg -i falcon-sensor_4.12.0-5704_amd64.deb
Then, had to run these three commands because of a dependency issue. Ignored a few notification-type errors.
sudo apt-get install libnl1
sudo apt-get upgrade
sudo apt-get -f install
Register your sensor:
sudo /opt/CrowdStrike/falconctl -s --cid=<YOURCIDGOESHERE>
Start the service:
sudo systemctl start falcon-sensor
Add proxy server and port (3128 is default for squid, your port may be different):
sudo /opt/CrowdStrike/falconctl -s --aph=myproxy.mydomain.or.ip --app=3128
There is other useful information in the doc (linked above), but these should get you going. Note, the proxy config is not required for all implementations.