OSError: cannot load library ‘libngspice.so’

Question

Good afternoon community, I am writing to you because I have encountered the following error trying to simulate the following filter that appears in the documentation.

enter link description herel

The error is as follows.

2020-05-23 00:45:37,954 - PySpice.Spice.NgSpice.Shared.NgSpiceShared.new_instance - INFO - New instance for id 0
2020-05-23 00:45:37,955 - PySpice.Spice.NgSpice.Shared.NgSpiceShared._load_library - WARNING - Set locale LC_NUMERIC to C

---------------------------------------------------------------------------

OSError                                   Traceback (most recent call last)

<ipython-input-6-475d4280ae1b> in <module>()
----> 1 simulator = circuit.simulator(temperature=25, nominal_temperature=25)
      2 analysis = simulator.ac(start_frequency=1@u_Hz, stop_frequency=1@u_MHz, number_of_points=10,  variation='dec')

8 frames

/usr/local/lib/python3.6/dist-packages/cffi/api.py in _load_backend_lib(backend, name, flags)
    825         if first_error is not None:
    826             msg = "%s.  Additionally, %s" % (first_error, msg)
--> 827         raise OSError(msg)
    828     return backend.load_library(path, flags)
    829 
OSError: cannot load library 'libngspice.so': libngspice.so: cannot open shared object file: No such file or directory.  Additionally, ctypes.util.find_library() did not manage to locate a library called 'libngspice.so'

I have installed all the dependencies, although I have run out of ideas, I am starting in the world of programming, however, they asked me for a job to simulate filters in the university. I need your help, if possible, a lot of fat in advance the characteristics of my system are ubuntu 18.04 , python 3.6.2, pyscpice 1.4.2 I already tried

apt-get install libngspice0 

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package libngspice0-dev

Answer 1

I am using Ubuntu 20.04 and this worked for me:

sudo apt update
sudo apt install libngspice0-dev

NOTE: I tried even installing libngspice and libngspice0, but nothing worked.