And, while you're there, check to see if you have dvb-usb-lme2510c-rs2000.fw in /lib/firmware. If not, you may need to find/create it and install it, then restart or unplug/replug the unit. All references I find are to modifying the Windows driver to create it, though, so I'm hoping it's not that.
Your window shot identifies it as an M88RS2000... is it a Chinese import, relatively cheap unit? I found some references on other threads to it being somewhat challenging to get working: not just the firmware, but also changes to some config files. I can't immediately sort that versus the TeVii S421 you show above, though, as that sounds like a completely different device.