Traceback (most recent call last):
File "/usr/bin/gnome-terminal", line 9, in <module>
from gi.repository import GLib, Gio
File "/home/victor/.local/lib/python3.6/site-packages/gi/__init__.py", line 42, in <module>
from . import _gi
ImportError: /home/victor/.local/lib/python3.6/site-packages/gi/_gi.cpython-36m-x86_64-linux-gnu.so: undefined symbol: g_interface_info_find_method

from gi.repository import GLib

$ type python3; readlink /usr/bin/python3
python3 is /usr/bin/python3
python3.6
$ echo "$PYTHONPATH"; python3 -c 'import sys; print(sys.path)'

['', '/usr/lib/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/victor/.local/lib/python3.6/site-packages', '/usr/local/lib/python3.6/dist-packages', '/usr/lib/python3/dist-packages']