This is actually because the linux source package doesn't reference 5.4.0-12 rather 5.4.0-9.
See https://launchpad.net/ubuntu/+source/linux and 'apt-cache showsrc linux'.
This is actually because the linux source package doesn't reference 5.4.0-12 rather 5.4.0-9.
See https:/ /launchpad. net/ubuntu/ +source/ linux and 'apt-cache showsrc linux'.