Using Synaptic, search again and ensure no Liqourix remains... The reason for removing it is that since it did not solve your issue, you are better off on the LTS supported kernel for Other Things. The Kernel is a very large set of drivers.
In terminal run:
sudo apt install linux-oem-20.04
You may get a message saying it is already installed.
You can test reboot, check
advanced Options and ensure it is not offering any Liqourix boot option.
If all is good, boot up normally and test...