i think there is a misunderstanding, i am talking about a usb broadband internet stick mentioned in the linked post.
Connecting to a phone works perfectly fine, this is how i am able to write as of this moment.
Is output of lsusb showing your dongle as mass storage device ?
According to the article which is shared by you, the solution consisted of few packages, importantly usb_modeswitch.
In one of the conversation on Ubuntu forum, the idea was to reinstall this package.
The latest version is usb_modeswitch 2.6.1-2 . If you install(re) and reboot the device then it should be solved.
Then why not unmount it first via file manager, then follow those steps given in your link ?
In Arch Linux Wiki, I found this :
ModemManager does not recognize the modem
In case ModemManager does not recognize the modem, check the unit status of ModemManager.service. If you get error messages such as Couldn't check support for device and not supported by any plugin, you may have to whitelist your device using the ModemManager filter rules.
Since this modem works in the live installer environment, you shouldn’t have to whitelist it; this suggests to me that perhaps there is a kernel regression. Assuming you are using the current kernel (5.16.12), have you tried the LTS kernel?
The linux-firmware package was split in January, with some firmware files being moved to other, new packages. This reduced the size of the linux-firmware package, but if you happen to need a driver that is no longer included, you will need to install that specific package. I don’t think that’s the issue here, but since the split occurred in January, and the EndeavourOS ISO is from December…I suppose it’s possible.
The fact that the modem works in the live environment suggests that something has changed since the ISO was created.
Let’s see what this command returns:
I’m going to be away from the computer for a couple of hours, so I may not get back to you for a bit. Perhaps someone else will jump in in the meantime.