Network problem (kubuntu 8.10)

[Michele Faresin]

Hello list!

This is the first i write something here, so please, be patient to me.
First of all, sorry for my bad english!
Second, let me explain the problem (google was'nt helpful this time): I've 
just updated from 8.04 to 8.10, without any problem. When I rebooted the 
system, my network did not work. Knetworkmanager is in "grey" status, and 
after i configured it manually (i use static ip), it always pop up "Device: 
eth0 State: disconnected"

This is about my ethernet card:

lshw -C network
  *-network
       description: Ethernet interface
       product: 88E8056 PCI-E Gigabit Ethernet Controller
       vendor: Marvell Technology Group Ltd.
       physical id: 0
       bus info: pci at 0000:02:00.0
       logical name: eth0
       version: 12
       serial: ###############
       size: 100MB/s
       capacity: 1GB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet 
physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=sky2 
driverversion=1.22 duplex=full firmware=N/A ip=192.168.1.100 latency=0 link=yes 
module=sky2 multicast=yes port=twisted pair speed=100MB/s
  *-network DISABLED
       description: Ethernet interface
       physical id: 1
       logical name: pan0
       serial: ############
       capabilities: ethernet physical
       configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A 
link=yes multicast=yes

route:

route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
0.0.0.0         192.168.1.1     0.0.0.0         UG    100    0        0 eth0

cat /etc/network/interface
auto eth0
iface eth0 inet static
address 192.168.1.100
network 192.168.0.0
netmask 255.255.255.0
broadcast 192.168.0.255
gateway 192.168.1.1

I can't fiugure out this:

sudo /etc/init.d/networking restart
 * Reconfiguring network interfaces...SIOCADDRT: No such process
Failed to bring up eth0.
                                                                                                                                                                             OK 

But if I do:

ifup -a
everithing works fine!!! 

Any suggestions?