Great. You installed it successfully.
Please tell us if Bluetooth now works?
If not then you can uninstall the test kernel with this command:
sudo dpkg -r linux-headers-4.18.0-041800rc6 linux-headers-4.18.0-041800rc6-generic linux-image-unsigned-4.18.0-041800rc6-generic linux-modules-4.18.0-041800rc6-generic_4.18.0-041800rc6.201807221830
and reboot again.
Great. You installed it successfully.
Please tell us if Bluetooth now works?
If not then you can uninstall the test kernel with this command:
sudo dpkg -r linux-headers- 4.18.0- 041800rc6 linux-headers- 4.18.0- 041800rc6- generic linux-image- unsigned- 4.18.0- 041800rc6- generic linux-modules- 4.18.0- 041800rc6- generic_ 4.18.0- 041800rc6. 201807221830
and reboot again.