Vamos levantar algumas informações sobre sua máquina, OK?
Desplugue o modem, plugue novamente. Aguarde um minuto, e execute os comandos abaixo.
dmesg | tail -20
lsusb
/usr/sbin/usb-modeswitch -h
dpkg-query --list usb_modeswitch\*
Resposta p/ comando dmesg | tail -20:[ 19.613693] mtrr: type mismatch for c0000000,8000000 old: write-back new: write-combining
[ 19.614008] agpgart-sis 0000:00:00.0: AGP 3.5 bridge
[ 19.614037] agpgart-sis 0000:00:00.0: putting AGP V3 device into 4x mode
[ 19.614108] pci 0000:01:00.0: putting AGP V3 device into 4x mode
[ 21.729152] EXT4-fs (sda3): re-mounted. Opts: errors=remount-ro,commit=0
[ 21.741359] EXT4-fs (sda5): re-mounted. Opts: commit=0
[ 22.058870] hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj.
[ 25.220028] sis190 0000:00:04.0: eth0: auto-negotiating...
[ 54.250030] usb 1-7: new high speed USB device using ehci_hcd and address 2
[ 54.465454] usbcore: registered new interface driver uas
[ 54.494845] Initializing USB Mass Storage driver...
[ 54.495550] scsi4 : usb-storage 1-7:1.0
[ 54.495872] usbcore: registered new interface driver usb-storage
[ 54.495875] USB Mass Storage support registered.
[ 55.491244] scsi 4:0:0:0: CD-ROM HSPA USB SCSI CD-ROM 2.31 PQ: 0 ANSI: 2
[ 55.494866] sr1: scsi-1 drive
[ 55.495096] sr 4:0:0:0: Attached scsi CD-ROM sr1
[ 55.495290] sr 4:0:0:0: Attached scsi generic sg2 type 5
[ 71.274855] ISO 9660 Extensions: Microsoft Joliet Level 1
[ 71.305001] ISOFS: changing to secondary root
Resposta p/ comando: lsusbBus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 07d1:a804 D-Link System
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Resposta p/ comando: /usr/sbin/usb-modeswitch -h :Arquivo ou diretório não encontrado.
Resposta p/ comando: dpkg-query --list usb_modeswitch\* :Nenhum pacote encontrado casando com usb_modeswitch*