Frequent segmentation faults in IsaacSim 6.0.0 on Ubuntu 26.04

[ScheglyakStas]

I have been using IsaacSim 6.0.0 on Ubuntu 26.04 for a couple of months already. Initially there were a few compatibility issues, but I've resolved them by installing libxml2 and libicu74 (as discussed in #656).

However, I am facing another issue - frequent crashes with "Segmentation fault (core dumped)".
They seem random, and usually happen when starting the simulation.
A couple of times they also happened immediately after IsaacSim startup, even before I've opened my environment file.
The environment I'm currently using is the IsaacSim warehouse with most obstacles removed, and a custom robot imported as a reference. The environment contains a lot of objects with "Convex Decomposition" collision type, in case that matters.

My hardware is:

• Ryzen 9 9950X
• RTX 5070 Ti
• 64GB DDR5

[vick-yu]

Two compounding issues explain the random crashes at simulation start.

1. Ubuntu 26.04 is not supported -- Isaac Sim 6.0.0 only validates Ubuntu 22.04 and 24.04
(requirements).
The libxml2/libicu74 workaround from #656
got you past the build issue, but the unsupported OS carries ongoing runtime risk.

2. Ubuntu 26.04 ships R595 NFB drivers by default -- Isaac Sim 6.0.0 requires R580.
The R595 New Feature Branch has a known regression causing segfaults on Blackwell GPUs
(seen across RTX 5070 Ti, RTX PRO 5000, and others: #671,
#677,
forum thread).

Confirm first:

nvidia-smi --query-gpu=driver_version --format=csv,noheader

Option A (recommended): Move to Ubuntu 24.04 -- eliminates both issues, fully supported,
your hardware is well above the minimum spec.

Option B: Stay on 26.04, install the validated driver manually

# Download 580.95.05 from https://www.nvidia.com/en-us/drivers/details/254666/
sudo sh NVIDIA-Linux-x86_64-580.95.05.run

Use the .run installer, not apt -- apt on 26.04 will pull R595 again. Ubuntu 26.04
still won't be supported after this, but it should resolve the crashes.

If crashes persist after switching drivers, share the Kit log and we can dig into the stack trace.

[vick-yu]

Hi @ScheglyakStas — we wanted to follow up since we haven't heard back after sharing the diagnosis and suggested fixes. We hope downgrading to the 580.95.05/595.58.03 driver or moving to Ubuntu 24.04 resolved the segfaults for you! If you're still experiencing crashes, please reopen this discussion. Thanks for your patience and for reporting this!