Xcb error occurs when launching isaacsim4.5 in ubuntu20.04

Omniverse Isaac Sim
1

Isaac Sim Version

4.5.0
4.2.0
4.1.0
4.0.0
4.5.0
2023.1.1
2023.1.0-hotfix.1
Other (please specify):

Operating System

Ubuntu 22.04
Ubuntu 20.04
Windows 11
Windows 10
Other (please specify):

GPU Information

  • Model: NVIDIA GeForce RTX 4090
  • Driver Version: 535.230.02

Topic Description

Detailed Description

Installing isaacsim using pip method, error occurs when executing isaacsim command

Steps to Reproduce

  1. Update glibc to GLIBC 2.35
  2. conda create -n env_isaaclab python=3.10
  3. conda activate env_isaaclab
  4. pip install torch==2.5.1 torchvision==0.20.1 --index-url https://download.pytorch.org/whl/cu118
  5. pip install --upgrade pip
  6. pip install 'isaacsim[all,extscache]==4.5.0' --extra-index-url https://pypi.nvidia.com
  7. isaacsim

Error Messages

(lab2) ubuntu@ubuntu-4090:~/workspaces$ isaacsim
Loading user config located at: '/home/ubuntu/.local/share/ov/data/Kit/Isaac-Sim Full/4.5/user.config.json'
[Info] [carb] Logging to file: /home/ubuntu/.nvidia-omniverse/logs/Kit/Isaac-Sim Full/4.5/kit_20250618_180725.log
2025-06-18 10:07:25 [0ms] [Warning] [omni.kit.app.plugin] No crash reporter present, dumps uploading isn't available.
[0.034s] [ext: omni.kit.async_engine-0.0.1] startup
[0.124s] [ext: omni.metrics.core-0.0.1] startup
[0.124s] [ext: omni.client.lib-1.0.0] startup
[0.140s] [ext: omni.blobkey-1.1.2] startup
[0.140s] [ext: omni.stats-1.0.1] startup
[0.140s] [ext: omni.datastore-0.0.0] startup
[0.143s] [ext: omni.client-1.2.2] startup
[0.197s] [ext: omni.ujitso.default-1.0.0] startup
[0.201s] [ext: omni.hsscclient-1.1.1] startup
[0.208s] [ext: omni.gpu_foundation.shadercache.vulkan-1.0.0] startup
[0.212s] [ext: omni.assets.plugins-0.0.0] startup
[0.213s] [ext: omni.gpu_foundation-0.0.0] startup
[0.217s] [ext: carb.windowing.plugins-1.0.0] startup
[0.221s] [ext: omni.kit.renderer.init-0.0.0] startup
2025-06-18 10:07:26 [241ms] [Error] [omni.platforminfo.plugin] failed to find the package that core 24 belongs to.
2025-06-18 10:07:26 [241ms] [Error] [omni.platforminfo.plugin] failed to find the package that core 25 belongs to.
2025-06-18 10:07:26 [241ms] [Error] [omni.platforminfo.plugin] failed to find the package that core 26 belongs to.
2025-06-18 10:07:26 [241ms] [Error] [omni.platforminfo.plugin] failed to find the package that core 27 belongs to.
2025-06-18 10:07:26 [241ms] [Error] [omni.platforminfo.plugin] failed to find the package that core 28 belongs to.
2025-06-18 10:07:26 [241ms] [Error] [omni.platforminfo.plugin] failed to find the package that core 29 belongs to.
2025-06-18 10:07:26 [241ms] [Error] [omni.platforminfo.plugin] failed to find the package that core 30 belongs to.
2025-06-18 10:07:26 [241ms] [Error] [omni.platforminfo.plugin] failed to find the package that core 31 belongs to.

|---------------------------------------------------------------------------------------------|
| Driver Version: 535.230.02    | Graphics API: Vulkan
|=============================================================================================|
| GPU | Name                             | Active | LDA | GPU Memory | Vendor-ID | LUID       |
|     |                                  |        |     |            | Device-ID | UUID       |
|     |                                  |        |     |            | Bus-ID    |            |
|---------------------------------------------------------------------------------------------|
| 0   | NVIDIA GeForce RTX 4090          | Yes: 0 |     | 24564   MB | 10de      | 0          |
|     |                                  |        |     |            | 2684      | 16760a40.. |
|     |                                  |        |     |            | 1         |            |
|=============================================================================================|
| OS: 20.04.6 LTS (Focal Fossa) ubuntu, Version: 20.04.6, Kernel: 5.15.0-139-generic
| XServer Vendor: The X.Org Foundation, XServer Version: 12013000 (1.20.13.0)
| Processor: Intel(R) Core(TM) i9-14900KF
| Cores: 24 | Logical Cores: 24
|---------------------------------------------------------------------------------------------|
| Total Memory (MB): 64106 | Free Memory: 14177
| Total Page/Swap (MB): 2047 | Free Page/Swap: 2047
|---------------------------------------------------------------------------------------------|
[0.604s] [ext: omni.kit.pipapi-0.0.0] startup
[0.605s] [ext: omni.materialx.libs-1.0.6] startup
[0.609s] [ext: omni.kit.pip_archive-0.0.0] startup
[0.609s] [ext: omni.usd.config-1.0.5] startup
[0.611s] [ext: omni.gpucompute.plugins-0.0.0] startup
[0.611s] [ext: omni.usd.libs-1.0.1] startup
[0.653s] [ext: omni.mdl-55.0.1] startup
[0.663s] [ext: omni.iray.libs-0.0.0] startup
[0.665s] [ext: omni.mdl.neuraylib-0.2.10] startup
[0.666s] [ext: omni.kit.usd.mdl-1.0.7] startup
[0.721s] [ext: omni.kit.telemetry-0.5.1] startup
[xcb] Unknown sequence number while appending request
[xcb] You called XInitThreads, this is not your fault
[xcb] Aborting, sorry about that.
[xcb] Extra reply data still left in queue
[xcb] This is most likely caused by a broken X extension library
[xcb] Aborting, sorry about that.
Segmentation fault (core dumped)

Additional Information

What I’ve Tried

I tried using two computers with the same version but different GPUs, but I couldn’t install them either

Related Issues

2

@fan-ziqi have you also tried some of the suggestions by the mods in this thread regarding the Unknown sequence number while appending request error?

1 Like
3

The problem was solved by replacing the conda source

conda config --add channels conda-forge
conda config --set channel_priority strict
2 Likes
4

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