Impossible to launch Nagstamon 3.18.0 on AlmaLinux 9 where 3.16.2 worked perfectly...

[TuxBel]

Nagstamon worked without any problem on my AlmaLinux 9 until version 3.16.2 but just after update to 3.18.0...

Upon launch I get this message:

[me@myhostname ~]$ nagstamon
Traceback (most recent call last):
File "/usr/bin/nagstamon", line 45, in
from Nagstamon.qui import (app,
File "/usr/lib/python3.9/site-packages/Nagstamon/qui/init.py", line 40, in
from Nagstamon.qui.helpers import (check_servers,
File "/usr/lib/python3.9/site-packages/Nagstamon/qui/helpers.py", line 26, in
from Nagstamon.servers import servers
File "/usr/lib/python3.9/site-packages/Nagstamon/servers/init.py", line 29, in
from Nagstamon.servers.Nagios import NagiosServer
File "/usr/lib/python3.9/site-packages/Nagstamon/servers/Nagios.py", line 20, in
from Nagstamon.servers.Generic import GenericServer
File "/usr/lib/python3.9/site-packages/Nagstamon/servers/Generic.py", line 35, in
from Nagstamon.cookies import (cookie_data_to_jar,
File "/usr/lib/python3.9/site-packages/Nagstamon/cookies.py", line 223, in
def has_valid_cookie(server_name: str, cookie_name: str, now: int | None = None, skew_seconds: int = 30) -> bool:
TypeError: unsupported operand type(s) for |: 'type' and 'NoneType'

And nothing gets launched...

Seems to be a python issue, what could I do to solve this ?

[HenriWahl]

Could this be related to ancient Python 3.9? Maybe try the flatpak from flathub.org which comes with its own Python.

[HenriWahl]

I wonder how you even managed to install it. I tried in a fresh container running almalinux:9 and can't install:

[root@05cc92d0dafc downloads]# dnf install ./nagstamon-3.18.0-1.rhel9.noarch.rpm 
Last metadata expiration check: 0:01:38 ago on Fri Feb 27 21:25:30 2026.
Error: 
 Problem: conflicting requests
  - nothing provides python3-SecretStorage needed by nagstamon-3.18.0-1.noarch from @commandline
  - nothing provides python3-arrow needed by nagstamon-3.18.0-1.noarch from @commandline
  - nothing provides python3-beautifulsoup4 needed by nagstamon-3.18.0-1.noarch from @commandline
  - nothing provides python3-keyring needed by nagstamon-3.18.0-1.noarch from @commandline
  - nothing provides python3-requests-kerberos needed by nagstamon-3.18.0-1.noarch from @commandline
  - nothing provides python3-tzlocal needed by nagstamon-3.18.0-1.noarch from @commandline
(try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

So I am more convinced the platform-independent flatpak would be the best choice.

[HenriWahl]

Alternatively you can try latest testing release - it is now Python 3.9 compatible again.

[HenriWahl]

Should be working in latest 3.18.1 release.