I had the same trouble with 7.10 Desktop Edition. Basically, it seems that the partition editor that runs while installing can't format a drive larger than 50 Gb or so. In any case, the solution is to ...
Can anyone shed some light on whythe Ubuntu 18.04.1 installer can't see any partitions on the NVMe disc (so I can't add a new partition after the existing ones) but if I hit ctrl-alt-F2 to get to ...