vmware-server package get error on apt

Binary package hint: apt

Ubuntu Feisty
I've added in the repos:
deb http://archive.canonical.com/ubuntu feisty-commercial main

Then I did:
sudo apt-get install vmware-server
...but I got the following error

Unpacking vmware-server (from .../vmware-server_1.0.2-2_i386.deb) ...
Setting up vmware-server (1.0.2-2) ...
Now configuring VMware Server. (This may take some time...)
Making sure services for VMware Server are stopped.

Stopping VMware services:
   Virtual machine monitor done

Do you want networking for your virtual machines? (yes/no/help) [yes]

Configuring a bridged network for vmnet0.

Your computer has multiple ethernet network interfaces available: eth0, eth1.
Which one do you want to bridge to vmnet0? [eth0]

The following bridged networks have been defined:

. vmnet0 is bridged to eth0

Do you wish to configure another bridged network? (yes/no) [no]

Do you want to be able to use NAT networking in your virtual machines? (yes/no)
[yes]

Configuring a NAT network for vmnet8.

Do you want this program to probe for an unused private subnet? (yes/no/help)
[yes]

Probing for an unused private subnet (this can take some time)...

We were unable to locate an unused Class C subnet in the range of private
network numbers. For each subnet that we tried we received a response to our
ICMP ping packets from a host at the network address intended for assignment to
this machine. Because no private subnet appears to be unused you will need to
explicitly specify a network number by hand.

What will be the IP address of your host on the private
network?

The answer "" is invalid. It must be of the form a.b.c.d where a, b, c and d
are decimal numbers between 0 and 255.

Invalid default answer!
Execution aborted.

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

The package can be installad through vmware-config-network.pl but the vmware-server resides in the apt as not completely installed packege and the only possibility is to remove it.