Can't open the manual and other "help" links (1.0)
#### Steps to reproduce: When clicked, the "Help" menu items do not open up in browser. - open Inkscape - Help > "Inkscape manual" #### What happened? an info box pops up: Traceback (most recent call last): File "launch_webbrowser.py", line 5, in <module> from argparse import ArgumentParser File "/tmp/.mount_inkscaf5gf2j/usr/lib/python2.7/argparse.py", line 86, in <module> import copy as _copy File "/tmp/.mount_inkscaf5gf2j/usr/lib/python2.7/copy.py", line 52, in <module> import weakref File "/tmp/.mount_inkscaf5gf2j/usr/lib/python2.7/weakref.py", line 14, in <module> from _weakref import ( ImportError: cannot import name _remove_dead_weakref #### What should have happened? Open the website manual pages #### Inkscape Version and Operating System: - Inkscape Version: 1.0alpha (inkscape@fb2bebf4919a011f0fd7cec085443d0031228e76, 2019-01-22) - Operating System: Ubuntu - Operating System version: 14.04
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