Now testing 4.4.0-040400rc3-generic:
$ lsb_release -r Release: 15.10
$ uname -r 4.4.0-040400rc3-generic
Now testing 4.4.0-040400rc3 -generic:
$ lsb_release -r
Release: 15.10
$ uname -r -generic
4.4.0-040400rc3