Can't reinstall modem manager Lubuntu 18.04

Please provide some details (and detail in a heading should be repeated in the actual description, as some of us may use browser/configs that cause the heading to be not be displayed when page is opened due to the heading’s large font size and some devices screen sizes)

  • If you entered a command, what was it? what was the output?
  • If you used a GUI, what program/package did you try and install? how? what were the messages you got in response?
  • if no messages, did do look in your systems logs for any clues?

Currently we have no details.