OSError: libtxc_dxtn.so: cannot open shared object file

Blender v2.80 Official Release Ubuntu Linux 64bit SourceIO v3.5.1

Traceback (most recent call last):
  File "/home/user/Downloads/Blender/blender-2.80-linux-glibc217-x86_64/2.80/scripts/modules/addon_utils.py", line 351, in enable
    mod = __import__(module_name)
  File "/home/user/.config/blender/2.80/scripts/addons/SourceIO/__init__.py", line 15, in <module>
    from .vtf.blender_material import BlenderMaterial
  File "/home/user/.config/blender/2.80/scripts/addons/SourceIO/vtf/blender_material.py", line 5, in <module>
    from ..vtf.import_vtf import import_texture
  File "/home/user/.config/blender/2.80/scripts/addons/SourceIO/vtf/import_vtf.py", line 6, in <module>
    from ..vtf.VTFWrapper import VTFLib
  File "/home/user/.config/blender/2.80/scripts/addons/SourceIO/vtf/VTFWrapper/VTFLib.py", line 40, in <module>
    class VTFLib:
  File "/home/user/.config/blender/2.80/scripts/addons/SourceIO/vtf/VTFWrapper/VTFLib.py", line 44, in VTFLib
    vtflib_cdll = cdll.LoadLibrary(os.path.join(full_path, vtf_lib_name))
  File "/home/user/Downloads/Blender/blender-2.80-linux-glibc217-x86_64/2.80/python/lib/python3.7/ctypes/__init__.py", line 434, in LoadLibrary
    return self._dlltype(name)
  File "/home/user/Downloads/Blender/blender-2.80-linux-glibc217-x86_64/2.80/python/lib/python3.7/ctypes/__init__.py", line 356, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: libtxc_dxtn.so: cannot open shared object file: No such file or directory

I believe this was mentioned here https://github.com/REDxEYE/SourceIO/issues/13#issuecomment-515693422 but I should have made it a separate issue earlier to reduce confusion.

[Ganonmaster]

libtxc_dxtn is an old library that is being used to provide S3TC support in the Linux version of VTFLib. Since there are likely no other libraries or programs on your computer that depend on this old library, it’s unlikely that it will cause side-effects.

Ideally VTFLib would be updated to implement modern libraries, but since that’s not a small task, we’re stuck with what we have.

[Ganonmaster]

@0Curtain0 The mesa-common-dev package can likely be installed without problem, as long as you do not change your default graphics driver to Mesa.

Installing the package on your system will also install its dependencies. In the worst case, it will also select mesa as the default graphics driver. If that happens, you might need to change this back to the right Nvidia driver.