malloc(): memory corruption

[CydKnocking]

I've successfully installed g2o on Python 3.6.8 following the instructions.
But when I import g2o, the following error occurred:
>>> import g2o
malloc(): memory corruption
Aborted (core dumped)
and my python exits automatically.
I'm using Ubuntu 18.04.1 as a virtual machine on my computer. Is it an issue related to my system or just a bug in g2opy?

[CydKnocking]

What's more, now I switched to Ubuntu 16.04.3 and successfully installed g2o on Python 3.5.2. However, an Segmentation fault occurred when I import g2o:
>>> import g2o
Segmentation fault (core dumped)
and python exits automatically again.
When I installed g2o at the last step in the instructions, there's the information shown in the terminal:
$ sudo python3.5 setup.py install
running install
copying ./lib/g2o.cpython-35m-x86_64-linux-gnu.so -> /usr/lib/python3/dist-packages
Is there something about python3 or python3.5? But there's no folder named dist-packages under python3.5...

[lookingz]

Try install package "libqglviewer-dev-qt4", then rebuild g2o and g2opy.

[CydKnocking]

Try install package "libqglviewer-dev-qt4", then rebuild g2o and g2opy.

Thanks a lot. I got the wrong way to rebuild g2opy...