My Ubuntu 24.04 installation is working great, and I have a list
running perfectly.  I'm now trying to install mailman3 on an older
server, this time runing ubuntu 22.04.  I'm following the venv
installation instructions again, but suddenly came up with a new error.

I've made it to the "Run database migrations"  section I run
mailmanweb-migrate and get:


(venv) mailman@mail:~$ mailman-web migrate
Traceback (most recent call last):
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/template/backends/django.py", line 128, in
get_package_libraries
   module = import_module(entry[1])
 File "/usr/lib/python3.10/importlib/__init__.py", line 126, in
import_module
   return _bootstrap._gcd_import(name[level:], package, level)
 File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
 File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
 File "<frozen importlib._bootstrap>", line 1006, in
_find_and_load_unlocked
 File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
 File "<frozen importlib._bootstrap_external>", line 883, in
exec_module
 File "<frozen importlib._bootstrap>", line 241, in
_call_with_frames_removed
 File "/opt/mailman/venv/lib/python3.10/site-
packages/postorius/templatetags/markdown.py", line 21, in <module>
   from readme_renderer import markdown as md_render
 File "/opt/mailman/venv/lib/python3.10/site-
packages/readme_renderer/markdown.py", line 16, in <module>
   from CommonMark import commonmark
ModuleNotFoundError: No module named 'CommonMark'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
 File "/opt/mailman/venv/bin/mailman-web", line 8, in <module>
   sys.exit(main())
 File "/opt/mailman/venv/lib/python3.10/site-
packages/mailman_web/manage.py", line 87, in main
   execute_from_command_line(sys.argv)
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/core/management/__init__.py", line 442, in
execute_from_command_line
   utility.execute()
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/core/management/__init__.py", line 436, in execute
   self.fetch_command(subcommand).run_from_argv(self.argv)
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/core/management/base.py", line 412, in run_from_argv
   self.execute(*args, **cmd_options)
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/core/management/base.py", line 458, in execute
   output = self.handle(*args, **options)
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/core/management/base.py", line 106, in wrapper
   res = handle_func(*args, **kwargs)
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/core/management/commands/migrate.py", line 100, in
handle
   self.check(databases=[database])
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/core/management/base.py", line 485, in check
   all_issues = checks.run_checks(
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/core/checks/registry.py", line 88, in run_checks
   new_errors = check(app_configs=app_configs, databases=databases)
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/core/checks/templates.py", line 60, in
check_for_template_tags_with_the_same_name
   for module_name, module_path in get_template_tag_modules():
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/template/backends/django.py", line 105, in
get_template_tag_modules
   for name in get_package_libraries(pkg):
 File "/opt/mailman/venv/lib/python3.10/site-
packages/django/template/backends/django.py", line 130, in
get_package_libraries
   raise InvalidTemplateLibrary(
django.template.library.InvalidTemplateLibrary: Invalid template
library specified. ImportError raised when trying to load
'postorius.templatetags.markdown': No mod
ule named 'CommonMark'




I know nothing about CommonMark.

Since I've suffered the error cascade problem of trying to fix things
and just making it worse, I stopped here.

Can I ignore this error, or what can I do to fix it?

Thanks!

billo

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