Expected behavior

DeDop Core installs successfully

Actual behavior

It fails when installing the dependency packages, specifically when installing widgestsnbextension. The error message shown is: Error: post-link failed for: widgetsnbextension-2.0.1-py36_0. Possibly related to conda-forge/widgetsnbextension-feedstock#18

Steps to reproduce the issue

1. Download installer file DeDop-core-1.5.0-Linux-x86_64.sh or DeDop-core-1.5.0-MacOSX-x86_64.sh
2. Run the installer
3. Observe an error during the installation

Specifications

dedop version: DeDop-core 1.5.0
OS: Ubuntu 18.04.1 LTS