At the start of May Dell announced an Ubuntu Linux option for their entry-level ~$700 Precision laptop while now they are closing out May by offering up Ubuntu 18.04 LTS on their higher-tier Precision laptop models. 

Ubuntu Linux has landed for the rest of Dell’s current generation Precision mobile workstation line-up with support for the Precision 5540, 7540, and 7740. The Precision 5540 offers options of Xeon E or 9th Gen Core CPUs with up to 64GB of RAM and options for a NVIDIA Quadro T2000. The Precision 7540/7740 meanwhile are more powerful mobile workstations with supporting up to 128GB of ECC RAM and latest generation processors. The Precision 7740 model can also accomodate NVIDIA Quadro RTX 5000 series graphics. 

via Phoronix