UBUNTU is not listed as a supported os.
Dell does not have any hardware specific versions.
M2 drives might not even show up at all.
When booting to the Ubuntu media on a system that only has a PCIe based m2 drive the Installer cannot locate a hard drive
(the installer usually only looks for /dev/sdx by default).
Add the following kernel argument at boot time:
Press 12 when you see the keyboard prompt:
Press Enter to select Language.
Modify the boot option to add "nvme_load=YES" and remove "quiet splash ---"