error: libstdc++.so.6 CXXABI_1.3.15 not found when running unitree inference example

[cyun9601]

When running inference example inside a Conda environment on a Unitree robot (Linux), the application fails to start with the following error:

[Error] [omni.ext._impl.custom_importer] Failed to import python module omni.kit.test.
Error: /lib/x86_64-linux-gnu/libstdc++.so.6: version `CXXABI_1.3.15' not found
(required by .../libicui18n.so.78)

Environment

OS: Linux (Ubuntu-based)
Python: 3.11 (Conda)
IsaacSim: 5.1.0
IsaacLab: 2.3.1

[cyun9601]

The issue was resolved by upgrading libstdcxx-ng to version 13 or higher in the conda environment.

conda remove libstdcxx-ng --force 
conda install -c conda-forge "libstdcxx-ng>=13" 
export LD_LIBRARY_PATH=$CONDA_PREFIX/lib:$LD_LIBRARY_PATH

Verify the installation by checking available CXXABI versions:

strings $CONDA_PREFIX/lib/libstdc++.so.6 | grep CXXABI