When launching my game from NVidia NSight, I get the following error message:
Preparing to launch...
Launch failure: Process creation failure
Launch failed.
The game launches just fine, but with no way to attach to it, I can't do frame debugging or anything else. There is no other error message or information that is logged. This is on Arch Linux.
This is probably not the answer you were hoping for, but after running into the same problem, I sent a bug report to Nvidia (https://developer.nvidia.com/rdp/bugs/nsight-graphics-bug-reporting) and I was told that Arch isn't supported at the moment (see https://developer.nvidia.com/nsight-graphics-requirements).
It's possible that, if there is enough demand, support could be added. So feel free to send them some feedback/request as well.
As an alternative, for debugging, RenderDoc works well enough on Arch, but it's not very good for profiling.