aptitude -r install linux-headers-$(uname -r)

root@employee:~# aptitude -r install linux-headers-$(uname -r)
The following NEW packages will be installed:
  linux-compiler-gcc-4.9-x86{a} linux-headers-4.0.0-kali1-amd64
  linux-headers-4.0.0-kali1-common{a} linux-kbuild-4.0{a}
0 packages upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
Need to get 5,652 kB of archives. After unpacking 36.0 MB will be used.
Do you want to continue? [Y/n/?] Y
Get: 1 http://http.kali.org/kali/ sana/main linux-compiler-gcc-4.9-x86 amd64 4.0.4-1+kali2 [301 kB]
Get: 2 http://http.kali.org/kali/ sana/main linux-headers-4.0.0-kali1-common amd64 4.0.4-1+kali2 [4,710 kB]
Get: 3 http://http.kali.org/kali/ sana/main linux-kbuild-4.0 amd64 4.0.2-1kali1 [175 kB]
Get: 4 http://http.kali.org/kali/ sana/main linux-headers-4.0.0-kali1-amd64 amd64 4.0.4-1+kali2 [466 kB]
Fetched 5,652 kB in 26s (211 kB/s)
Selecting previously unselected package linux-compiler-gcc-4.9-x86.
(Reading database ... 323629 files and directories currently installed.)
Preparing to unpack .../linux-compiler-gcc-4.9-x86_4.0.4-1+kali2_amd64.deb ...
Unpacking linux-compiler-gcc-4.9-x86 (4.0.4-1+kali2) ...
Selecting previously unselected package linux-headers-4.0.0-kali1-common.
Preparing to unpack .../linux-headers-4.0.0-kali1-common_4.0.4-1+kali2_amd64.deb ...
Unpacking linux-headers-4.0.0-kali1-common (4.0.4-1+kali2) ...
Selecting previously unselected package linux-kbuild-4.0.
Preparing to unpack .../linux-kbuild-4.0_4.0.2-1kali1_amd64.deb ...
Unpacking linux-kbuild-4.0 (4.0.2-1kali1) ...
Selecting previously unselected package linux-headers-4.0.0-kali1-amd64.
Preparing to unpack .../linux-headers-4.0.0-kali1-amd64_4.0.4-1+kali2_amd64.deb ...
Unpacking linux-headers-4.0.0-kali1-amd64 (4.0.4-1+kali2) ...
Setting up linux-compiler-gcc-4.9-x86 (4.0.4-1+kali2) ...
Setting up linux-headers-4.0.0-kali1-common (4.0.4-1+kali2) ...
Setting up linux-kbuild-4.0 (4.0.2-1kali1) ...
Setting up linux-headers-4.0.0-kali1-amd64 (4.0.4-1+kali2) ...