Have problem with USB Astrometa DVB-T2, model TVR801 (I think, because in dmesg is Realtek RTL2832P and Rafael Micro R820T).
Have Debian 9 - Stretch in Omnia LXC, Astrometa is visible in dmesg:
[678872.642826] usb 2-1: new high-speed USB device number 3 using xhci-hcd
[678872.800545] usb 2-1: dvb_usb_v2: found a ‘Astrometa DVB-T2’ in warm state
[678872.875520] usb 2-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
[678872.875604] DVB: registering new adapter (Astrometa DVB-T2)
[678872.880292] i2c i2c-9: Added multiplexed i2c bus 10
[678872.880304] rtl2832 9-0010: Realtek RTL2832 successfully attached
[678872.880319] usb 2-1: DVB: registering adapter 0 frontend 0 (Realtek RTL2832 (DVB-T))…
[678872.880462] r820t 10-003a: creating new instance
[678872.891890] r820t 10-003a: Rafael Micro r820t successfully identified
[678872.899898] Registered IR keymap rc-empty
[678872.900110] input: Astrometa DVB-T2 as /devices/platform/soc/soc:internal-regs/f10f0000.usb3/usb2/2-1/rc/rc0/input1
[678872.900117] rc0: Astrometa DVB-T2 as /devices/platform/soc/soc:internal-regs/f10f0000.usb3/usb2/2-1/rc/rc0
[678872.900569] usb 2-1: dvb_usb_v2: schedule remote query interval to 200 msecs
[678872.917453] usb 2-1: dvb_usb_v2: ‘Astrometa DVB-T2’ successfully initialized and connected
Problem is, that is no device in Tvheadend (Configuration -> DVB Inputs -> TV adapters).