OSError: [Errno 8] Exec format error: 'chromedriver' using chromedriver on ubuntu server

I'm trying to use chromedriver with ubuntu (AWS instance). I've gotten chromedriver to work no problem in a local instance, but having many, many issues doing so in a remote instance.

I'm using the following code:

options = Options()
options.add_argument('--no-sandbox')
options.add_argument('--headless')
options.add_argument('--disable-dev-shm-usage')
options.add_argument("--remote-debugging-port=9222")

driver = webdriver.Chrome(executable_path='/usr/bin/chromedriver', chrome_options=options)

However, I keep getting this error:

    Traceback (most recent call last):
  File "test.py", line 39, in <module>
    driver = webdriver.Chrome()
  File "/home/ubuntu/.local/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__
    self.service.start()
  File "/home/ubuntu/.local/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 76, in start
    stdin=PIPE)
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 8] Exec format error: 'chromedriver'

I believe I'm using the most updated version of Selenium, Chrome, and chromedriver.

Chrome version is:Version 78.0.3904.70 (Official Build) (64-bit)

Selenium:

ubuntu@ip-172-31-31-200:/usr/bin$ pip3 show selenium
Name: selenium
Version: 3.141.0
Summary: Python bindings for Selenium
Home-page: https://github.com/SeleniumHQ/selenium/
Author: UNKNOWN
Author-email: UNKNOWN
License: Apache 2.0
Location: /home/ubuntu/.local/lib/python3.6/site-packages
Requires: urllib3

And, finally, for chromedriver, I'm almost certain I downloaded the most recent version here: https://chromedriver.storage.googleapis.com/index.html?path=78.0.3904.70/. It's the mac_64 version (I'm using Ubuntu on a Mac). I then placed chromedriver in /usr/bin , as I read that's common practice.

I have no idea why this isn't working. A few options I can think of:
1) some sort of access issue? I'm a beginner with command line and ubuntu - should I be running this as "root" user?

2) mis-match between chromedriver and chrome versions? Is there a way to tell which chromedriver version I have for certain?

3) I see that chromedriver and selenium are in different locations. Selenium is in: Location: /home/ubuntu/.local/lib/python3.6/site-packages and I've moved chromedriver to: /usr/bin . Could this be causing problems?

Any help appreciated as I'm stumped.

from OSError: [Errno 8] Exec format error: 'chromedriver' using chromedriver on ubuntu server