Try
sudo systemctl stop tvheadend
rm ~/.hts/tvheadend/input/linuxdvb/adapters/*
sudo systemctl start tvheadend
Then enable just the DVB-C tuner in the tvh webui.
Try
sudo systemctl stop tvheadend
rm ~/.hts/tvheadend/input/linuxdvb/adapters/*
sudo systemctl start tvheadend
Then enable just the DVB-C tuner in the tvh webui.