8 years ago
  Huawei (Mobile Broadband dongle)
  Mint (older version)
  Isn't detected or recognized
What works:

The modem is recognised as a USB memory stick.

What doesn't work:

The system do not recognise it as an USB mobile broadband modem.

What was done to make it work:

I installed usb_modeswitch which switches the function of the stick from memory to modem. You will find it in the Software manager. After installing, it works perfectly, no further tweaking is required.

Additional notes:

usb_modeswitch should be installed in Linux Mint as default imho. Further reading: http://www.draisberghof.de/usb_modeswitch/