ROS2 Bouncy error: no module named rosidl_generator_c [closed]

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Hello everyone, I am using Ubuntu 18.04 and trying to build ROS2 Bouncy.

The thing is, first I had problems building rosidl_generator_py which could not link to libpython3.6m.a because it was not built with -fPIC. That was a little odd so I tried installing Python 3.6 manually from source using ./configure --enable-shared. However, new library did not show up. Then I messed around with update-alternatives (I have not touched any Python symbolic links since I know it could brick my system). Tried building again and now I'm getting this error:

Starting >>> rosidl_generator_c
Starting >>> rosidl_generator_dds_idl
--- stderr: rosidl_generator_c                                                                                                                
Traceback (most recent call last):
File "/home/rtrk/ros2_ws/src/ros2/rosidl/rosidl_generator_c/bin/rosidl_generator_c", line 8, in <module>
from rosidl_generator_c import generate_c
ModuleNotFoundError: No module named 'rosidl_generator_c'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "/home/rtrk/ros2_ws/src/ros2/rosidl/rosidl_generator_c/bin/rosidl_generator_c", line 20, in <module>
rosidl_generator_c = loader.load_module()
 File "<frozen importlib._bootstrap_external>", line 399, in _check_name_wrapper
 File "<frozen importlib._bootstrap_external>", line 823, in load_module
 File "<frozen importlib._bootstrap_external>", line 682, in load_module
 File "<frozen importlib._bootstrap>", line 265, in _load_module_shim
 File "<frozen importlib._bootstrap>", line 684, in _load
 File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
 File "<frozen importlib._bootstrap_external>", line 678, in exec_module
 File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
 File "/home/rtrk/ros2_ws/src/ros2/rosidl/rosidl_generator_c/rosidl_generator_c/__init__.py", line 17, in <module>
 from rosidl_cmake import convert_camel_case_to_lower_case_underscore
File "/home/rtrk/ros2_ws/install/rosidl_cmake/lib/python3.6/site-packages/rosidl_cmake/__init__.py", line 21, in <module>
import em
ModuleNotFoundError: No module named 'em'
make[2]: *** [rosidl_generator_c/rosidl_generator_c/msg/bool.h] Error 1
make[1]: *** [CMakeFiles/rosidl_generator_c_interfaces__rosidl_generator_c.dir/all] Error 2
make: *** [all] Error 2
---
Failed   <<< rosidl_generator_c [ Exited with code 2 ]
Aborted  <<< rosidl_generator_dds_idl
--- stderr: rcutils                                           
Traceback (most recent call last):
File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'em'
make[2]: *** [include/rcutils/logging_macros.h] Error 1
make[1]: *** [CMakeFiles/rcutils.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [all] Error 2
---
Aborted  <<< rcutils

I hope someone can help me with this issue and I will provide some more relevant info if needed.

Thank you in advance.