Error installing on Ubuntu

[gbrookshire]

** I eventually got this working. I've left these comments for anyone who runs into the same errors I did. **

I tried installing following the instructions here:
https://jonescompneurolab.github.io/hnn/installer/ubuntu/

Initially bash hnn-ubuntu.sh crashed because of problems with unrelated PPAs. I fixed those issues and the ran the script again, and it successfully downloaded the directory hnn_source_code/.

When I try to run HNN, I get this error:

$ python hnn.py                                                                            (hnn) 
Traceback (most recent call last):
  File "hnn.py", line 10, in <module>
    from hnn_qt5 import *
  File "/home/geoff/Downloads/hnn_source_code/hnn_qt5.py", line 4, in <module>
    from PyQt5.QtWidgets import QMainWindow, QAction, qApp, QApplication, QToolTip, QPushButton, QFormLayout
ImportError: No module named PyQt5.QtWidgets

When I try to install PyQt5, I get a message saying it's already installed.

$ pip install PyQt5                                                                        (hnn) 
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: PyQt5 in /home/geoff/.local/lib/python3.6/site-packages (5.15.2)
Requirement already satisfied: PyQt5-sip<13,>=12.8 in /home/geoff/.local/lib/python3.6/site-packages (from PyQt5) (12.8.1)

Directly importing PyQT in python works fine:

$ python                                                                                   (hnn) 
Python 2.7.17 (default, Sep 30 2020, 13:38:04) 
[GCC 7.5.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import PyQt5
>>> 

I tried uninstalling and reinstalling PyQt like this:

pip uninstall PyQt5
pip uninstall pyqtwebengine
pip install PyQt5==5.12.1 pyqtwebengine==5.12.1

And now I'm getting this error:

$ python hnn.py                                                                            (hnn) 
Traceback (most recent call last):
  File "hnn.py", line 10, in <module>
    from hnn_qt5 import *
  File "/home/geoff/Downloads/hnn_source_code/hnn_qt5.py", line 4, in <module>
    from PyQt5.QtWidgets import QMainWindow, QAction, qApp, QApplication, QToolTip, QPushButton, QFormLayout
ImportError: /home/geoff/.local/lib/python3.6/site-packages/PyQt5/QtWidgets.so: undefined symbol: _Py_Dealloc

I was using the fish shell for this. When I uninstall everything and try again in a bash shell, it hangs for a few minutes and then installs and gives this error:

$ python3 hnn.py 
Traceback (most recent call last):
  File "hnn.py", line 10, in <module>
    from hnn_qt5 import *
  File "/home/geoff/Downloads/hnn_source_code/hnn_qt5.py", line 29, in <module>
    import nlopt
ModuleNotFoundError: No module named 'nlopt'

After running pip install nlopt, it's working! For anyone who runs into the same problems in the future, here are the steps I used to get HNN working in Ubuntu 18.04:

• Delete any PPAs that throw warnings or errors.
• Use bash instead of another shell (which is surprising since the installation script is explicitly called with bash)
• Manually run pip install nlopt.

[blakecaldwell]

Thanks for including the fixes to your issue @gbrookshire. An upcoming update to the documentation includes the necessary pip install commands, and does not have the user run hnn-ubuntu.sh

[blakecaldwell]

Fixed in #280