MyPaint Nightly ошибка flatpack

flatpak run org.mypaint.MyPaint-Nightly
INFO: mypaint: Installation layout: conventional POSIX-like structure with prefix u'/app'
Traceback (most recent call last):
  File "/app/bin/mypaint", line 446, in <module>
    = get_paths()
  File "/app/bin/mypaint", line 215, in get_paths
    from lib import fileutils
  File "/app/lib/mypaint/lib/fileutils.py", line 24, in <module>
    import lib.gichecks
  File "/app/lib/mypaint/lib/gichecks.py", line 18, in <module>
    import gi
  File "/app/lib/python2.7/site-packages/gi/__init__.py", line 42, in <module>
    from . import _gi
ImportError: /app/lib/python2.7/site-packages/gi/_gi.so: undefined symbol: PyUnicodeUCS2_AsUTF8String
ratte@linux-ldi7:~>