You are lucky. My laptop’s fingerprint scanner did not work out of the box. I also had troubles with audio (“subwoofer” was disabled) and WiFi (losing connection). This all was fixed in later Ubuntu updates, but I had to wipe out Dell’s spyware manually. So I’d say Dell with preinstalled Ubuntu is the same as any laptop with FreeDOS: you have to install the OS you need instead preinstalled one and troubleshoot all the driver issues. No guarantees that all hardware is Linux compatible.