I can confirm this bug here, I have the same Motorola Si3054 software
modem and the output to sudo /etc/init.d/sl-modem-daemon start is:
FATAL: Module ungrab_winmodem not found.
FATAL: Module slamr not found.
** Changed in: sl-modem (Ubuntu)
Status: New => Confirmed
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Motorola Si3054 software modem not working
https://bugs.launchpad.net/bugs/150840
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