Certainly:
sudo apt install linux-headers-5.8.0-63-generic linux-modules-5.8.0-63-generic linux-modules-extra-5.8.0-63-generic linux-image-5.8.0-63-generic
sudo apt install linux-headers-5.4.0-81-generic linux-modules-5.4.0-81-generic linux-modules-extra-5.4.0-81-generic linux-image-5.4.0-81-generic
Once kernels are installed, you can Reboot to select and boot into the other kernel:
If we find a working kernel, you can set it as default instead of booting by default into the latest kernel