Can you please download the following driver:
Open your Downloads folder, right click the Linux_BT_USB...tar.gz file and select extract here.
Double click into the newly created Linux_BT_USB... directory. Right click an open area and select "Open in terminal."
If the menu does not have that option for Gnome's file manager, then open a terminal with keyboard shortcut ctrl+alt+t
Paste into it:
cd ~/Downloads/Linux_BT_USB_v3.10_20170802_8821CU_BTCOEX_20170516-1616
Now enter in the installation command:
sudo make install -s
Check configuration:
hciconfig -a
Once done, reboot and test...