Hi there,
So it’s been on here before, this NVME issue. Check the threads for more in depth but 2 possibilities
1 is flash it in an external USB to NVME drive case, What temps is it getting hot to the touch on heatsink?
One guy ran a fan on it or hairdryer on Cool to get it to go.
I never saw so many issues with updating these things that folks are having. search the threads you find some additional possibilities to a fix. Even the version of Ubuntu makes a dif.
HTH
GL 
PJ
