loguser1@loguser1-pc1dtop1:~$ sudo sh -c "echo ltserial >> /etc/modules"
Password:
loguser1@loguser1-pc1dtop1:~$ sudo sh -c "echo ltmodem >> /etc/modules"
loguser1@loguser1-pc1dtop1:~$ sudo modprobe ltserial
FATAL: Module ltserial not found.
loguser1@loguser1-pc1dtop1:~$ sudo modprobe ltmodem
FATAL: Module ltmodem not found.
loguser1@loguser1-pc1dtop1:~$