[Netkit.users] problem: install mysql-server

[Nunzio Brugaletta]

Hello,
I'm itc teacher and now I use netkit for networking teaching. I need to 
add some packages: mysql, php.
I have tried so long to install mysql-server (apt-get update && apt-get 
install mysql-server in vm or mount -o loop fs) but I read always this 
message:

dpkg: error processing sysv-rc (--configure):
  subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
  sysv-rc
E: Sub-process /usr/bin/dpkg returned an error code (1)

I run netkit under Ubuntu 12.04.
How can I do to install these packages?

Thanks.
Regards
-- 
Nunzio Brugaletta
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