Comment 7 for bug 1890641

I too have the same error, I received the following after running an apt upgrade

W: Possible missing firmware /lib/firmware/rtl_nic/rtl8125a-3.fw for module r8169
W: Possible missing firmware /lib/firmware/rtl_nic/rtl8168fp-3.fw for module r8169
W: Possible missing firmware /lib/firmware/amdgpu/renoir_gpu_info.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_asd.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_rlc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_mec2.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_mec.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_me.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_pfp.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_ce.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_sdma.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/renoir_vcn.bin for module amdgpu

in my case downloading from the link above and doing the following fixed the errors for me.
sudo cp -R amdgpu/renoir_* /lib/firmware/amdgpu/
sudo cp -R rtl_nic/rtl8* /lib/firmware/rtl_nic/
sudo update-initramfs -u

Thanks @faloz2416

Mo