cant find killall program (debian)

Försöker installera VMware på en debian maskin men får:

Setup is unable to find the "killall" program on your machine. Please make sure
it is installed. Do you want to specify the location of this program by hand?

något jag missar?

jepp, det körs som su
annars får jag:

Please re-run this program as the super user.

apt-get install psmisc

Fungerade bra men har fått ett till problem nu. Den verkar inte hitta C header files

What is the location of the directory of C header files that match your running
kernel? [/usr/src/linux/include] /usr/src/linux

The path "/usr/src/linux" is not an existing directory.