Does after installation of the dvb driver package, the network-drivers package is also installed?
I moved to MLD 5.4 right away after facing the same problem so i don't remember.
Anyway please check the following log, i powered my rpi without dvb receiver ... waited for MLD to load then attached the dvb receiver however there is a problem loading the driver so it doesn't support plug and play
(i must reboot to make it work but the network will stop working)
Dec 2 16:52:46 (none) user.info kernel: [ 9061.336298] usb 1-1.2: new high-speed USB device number 6 using dwc_otg
Dec 2 16:52:46 (none) user.info kernel: [ 9061.466745] usb 1-1.2: New USB device found, idVendor=14f7, idProduct=0500
Dec 2 16:52:46 (none) user.info kernel: [ 9061.466760] usb 1-1.2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
Dec 2 16:52:46 (none) user.info kernel: [ 9061.485173] technisat-usb2: set alternate setting
Dec 2 16:52:47 (none) user.info kernel: [ 9061.986320] dvb-usb: found a 'Technisat SkyStar USB HD (DVB-S/S2)' in cold state, will try to load a firmware
Dec 2 16:52:47 (none) user.info kernel: [ 9061.990815] dvb-usb: downloading firmware from file 'dvb-usb-SkyStar_USB_HD_FW_v17_63.HEX.fw'
Dec 2 16:52:47 (none) user.info kernel: [ 9062.057416] usbcore: registered new interface driver dvb_usb_technisat_usb2
Dec 2 16:52:47 (none) user.info kernel: [ 9062.323446] usb 1-1.2: USB disconnect, device number 6
Dec 2 16:52:47 (none) user.info kernel: [ 9062.324066] dvb-usb: generic DVB-USB module successfully deinitialized and disconnected.
Dec 2 16:52:49 (none) user.info kernel: [ 9063.896330] usb 1-1.2: new high-speed USB device number 7 using dwc_otg
Dec 2 16:52:49 (none) user.info kernel: [ 9064.027495] usb 1-1.2: New USB device found, idVendor=14f7, idProduct=0500
Dec 2 16:52:49 (none) user.info kernel: [ 9064.027508] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Dec 2 16:52:49 (none) user.info kernel: [ 9064.027517] usb 1-1.2: Product: TechniSat USB device
Dec 2 16:52:49 (none) user.info kernel: [ 9064.027526] usb 1-1.2: Manufacturer: TechniSat Digital
Dec 2 16:52:49 (none) user.info kernel: [ 9064.027534] usb 1-1.2: SerialNumber:
Dec 2 16:52:49 (none) user.info kernel: [ 9064.028923] technisat-usb2: set alternate setting
Dec 2 16:52:49 (none) user.info kernel: [ 9064.029085] technisat-usb2: firmware version: 17.63
Dec 2 16:52:49 (none) user.info kernel: [ 9064.029092] dvb-usb: found a 'Technisat SkyStar USB HD (DVB-S/S2)' in warm state.
Dec 2 16:52:49 (none) user.info kernel: [ 9064.030045] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
Dec 2 16:52:49 (none) user.info kernel: [ 9064.032317] dvb-usb: Technisat SkyStar USB HD (DVB-S/S2) error while loading driver (-12)