I have done this last weekend an install using Debian Buster and also gr-satnogs 2.0.1. I have to compile rtl_biast as explained in the wiki. After that, checked it works running the executable from the directory :
$ /home/pi/rtl_biast/build/src/rtl_biast -b 1
Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001
Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Then, check permissions, so that the satnogs user can launch the script from satnogs-client. Then, set the pre/post observation scripts in satnogs-setup.
By the way, I did have problems because misconfiguring a new parameter, SATNOGS_SOAPY_RX_DEVICE, which in my case, the correct value is driver=rtlsdr.