dkms wrong version of linux-headers

Binary package hint: dkms

OS: Ubuntu Server intrepix Ibex 8.10
Kernel: 2.6.27-9-server

When trying to install dkms it wants to install "linux-headers-2.6.27-3-rt" instead of "linux-headers-2.6.27-9-server", so any module fails to compile.

Workaround:
 # apt-get install linux-headers-server
that brings the right header version of running kernel.

Below the result of command:
LANG=C sudo apt-get install dkms
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  fakeroot gcc gcc-4.3 libc6-dev libgomp1 linux-headers-2.6.27-3-rt
  linux-libc-dev make
Suggested packages:
  gcc-multilib manpages-dev autoconf automake1.9 libtool flex bison gdb
  gcc-doc gcc-4.3-multilib libmudflap0-4.3-dev gcc-4.3-doc gcc-4.3-locales
  libgcc1-dbg libgomp1-dbg libmudflap0-dbg glibc-doc make-doc
The following NEW packages will be installed:
  dkms fakeroot gcc gcc-4.3 libc6-dev libgomp1 linux-headers-2.6.27-3-rt
  linux-libc-dev make
0 upgraded, 9 newly installed, 0 to remove and 0 not upgraded.
Need to get 12.7MB of archives.
After this operation, 73.3MB of additional disk space will be used.
Do you want to continue [Y/n]? n
Abort.