Here are the steps I followed (all on Eoan):
sudo apt install kernel-package linux-source flex bison libssl-dev libelf-dev
tar xf /usr/src/linux-source-5.3.0.tar.bz2
cd linux-source-5.3.0
make mrproper
cp /usr/lib/modules/5.3.0-46-generic/build/{.config,Module.symvers} .
make oldconfig
patch -p1 < ../btusb-Enablement-of-HCI_QUIRK_BROKEN_STORED_LINK_KEY-quirk.patch
make EXTRAVERSION=-ubuntu1-1 modules_prepare
make M=drivers/bluetooth
xz drivers/bluetooth/btusb.ko
sudo cp -f drivers/bluetooth/btusb.ko.xz
/usr/lib/modules/5.3.0-46-generic/updates
sudo depmod
sudo modprobe -r btusb
Now when I insert the dongle, I get
[ 4831.984499] btusb: version magic '5.3.18-ubuntu1-1 SMP mod_unload ' should
be '5.3.0-46-generic SMP mod_unload '
Obviously, the EXTRAVERSION isn't right yet, but why is that module
reporting itself as 5.3.18 when I built it from 5.3.0 source?
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https://bugs.launchpad.net/bugs/1873718
Title:
CSR8510 based BTA-402 Bluetooth device cannot be started
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