Runtime error on Scribus CMYK PDF export
#### Summary: On exporting to Scribus CMYK PDF I got this Python error: ``` Traceback (most recent call last): File "scribus_export_pdf.py", line 152, in <module> Scribus().run() File "/tmp/.mount_InkscadfDxc9/usr/share/inkscape/extensions/inkex/base.py", line 140, in run self.save_raw(self.effect()) File "/tmp/.mount_InkscadfDxc9/usr/share/inkscape/extensions/inkex/base.py", line 165, in save_raw self.save(self.options.output) File "scribus_export_pdf.py", line 147, in save call(SCRIBUS_EXE, '-g', '-py', py_file, svg_file, pdf_file) File "/tmp/.mount_InkscadfDxc9/usr/share/inkscape/extensions/inkex/command.py", line 182, in call return _call(program, *args, **kwargs) File "/tmp/.mount_InkscadfDxc9/usr/share/inkscape/extensions/inkex/command.py", line 171, in _call raise ProgramRunError("Return Code: {}: {}\n{}\nargs: {}".format( inkex.command.ProgramRunError: Return Code: 1: b'Gtk-Message: 20:37:30.710: Failed to load module "canberra-gtk-module"\nGtk-Message: 20:37:30.711: Failed to load module "canberra-gtk-module"\nImportError: No module named site\n' b'' args: ['/usr/bin/scribus', '-g', '-py', '/tmp/inktmpmty4_aqv/scribus.py', '/tmp/inktmpmty4_aqv/in.svg', '/tmp/inktmpmty4_aqv/out.pdf'] ``` #### Steps to reproduce: - Install Scribus. - Download Inkscpape 1.0.1 appImage and start it. - Create a new document. Follow [steps](https://wiki.inkscape.org/wiki/index.php/Release_notes/1.0.1#Color-managed_PDF_export_using_Scribus) decribed in wiki. - Export to Scribus CMYK PDF #### What happened? - Above error occurred. #### What should have happened? - Exporting should be work. #### Version Info: ``` - Inkscape Version: 1.0.1 (3bc2e81, 2020-09-07) official appImage(!) - Scribus version: 1.5.5 (31. July 2019, Build ID: C--T-F-C1.16.0-64bit, 9.50 Ghostscript) /usr/bin/scribus - Operating System: Ubuntu - Operating System version: 20.04 ```
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