Canonical adds "Ubuntu"
Ubuntu kernel-release = 5.4.0-12.15-generic
kernel version is 5.4, which is identical to upstream stable kernel version
.0 is an obsolete parameter left over from older upstream kernel version naming practices
-12 application binary interface (ABI) bump for this kernel
.15 upload number for this kernel
-generic is kernel flavour parameter, where -generic is the default Ubuntu kernel flavour
Mainline kernel-version = 5.4.8
来自https://ubuntu.com/kernel