$ sudo apt-get update
$ sudo apt-get install libmodemmanagerqt1 

libmodemmanagerqt1 is installed in your system.

Make ensure the libmodemmanagerqt1 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libmodemmanagerqt1 *

You will get with libmodemmanagerqt1 package name, version, architecture and description in a table

libmodemmanagerqt1 package basic information: