[PROBLEM] Hifiberry digi+ on Raspberry pi2

[bonestaak]

xbian@xbian ~ $ sudo apt-get install alsa-base alsa-utils
[sudo] password for xbian:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package alsa-base is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

Package alsa-utils is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'alsa-base' has no installation candidate
E: Package 'alsa-utils' has no installation candidate
xbian@xbian ~ $

I'm sorry i don't have experience with programming (linux)
I have downloaded 2 packages
linux-image-bcm2836_4.1.3+-1437860820_armhf.deb
xbian-package-firmware_2.3.0_armhf.deb
Are this the packages i needed? (i thought i read it in a message)
If yes must these files copied to a directory on my xbian card? which directory?
sudo apt-get install alsa-base alsa-utils do i add a path somewhere on this command?
I am a technician i do everything with hardware but i don't have experience with programming. Im sorry.