Error running modemmanager

I'm working with Ubuntu 20.04.02, modemmanager, and Telit LE910 Cat 1. I'm able to install modemmanager, it detects the modem and everything looks correct. But when I try to start Modem-Manager-gui it gives the following error:

/usr/bin/deb-systemd-helper: error: systemctl preset failed on ModemManager.service: No such file or directory 

It also gives me the following error.

(modem-manager-gui:87228): Gtk-CRITICAL **: 14:11:01.931: gtk_tree_model_iter_nth_child: assertion 'n >= 0' failed

Thanks for your help

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