ERROR: The interface does not exist (UBUNTU) interface eth0 not configured
 

Hi,
I am new to linux i have installed Ubuntu8.04 to external maxtor hard drive, the other os's which i am using are win 2k and xp installed to internal hard drives, i am not able to configure internet settings in ubuntu 8.04, i am using broadband inet connection through ethernet cable which is directly connected to my computer which has inbuilt network interface card(Ethernet Controller Intel corp/PRO/100 VE Network Connection PCI bus4, device , i am able to see the connection connected in networks ubuntu shows it as windows network i configured it as wired connection and via using static ip, subnet mask, gateway and also provided DNS as provided to me by the ISP and also after looking at windows tcpip properties. and then i checked up in terminal by typing sudo gedit /etc/network/interfaces it is showing me the iface eth0 with all the settings i entered. when i type sudo ifdown eth0 it gives me error:SIOCADDRT: No such process failed to bring up eth0, when i open network tools and click on configure button after selecting eth0 it gives me error: THe interface does not exist, check that it is correctly typed in terminal when i type gksu network-admin the window opens up, but the unlock button remains greyed out, when i try to ping -c5 127.0.0.1 or the server or any other website it says connect:Network is unreachable.

PLease help me resolving this bcoz here no one knows how to resolve this all from my isp people to other technical people all are window OS fans, I am stuck for 4 days tried different solutions nothing works out

SOME MORE REPLIEAS WHICH I GOT WHILE CONFIGURING eth0

Hi,

the main issue is whenever i click on configure button in network tools after selecting eth0 it gives error as follows

The interface does not exist, Check that it is correctly typed

i am pasting the output of various comds i typed in terminal

ab@ab-desktop:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:19:d1:6f:93:5f
inet addrxx.xx.xxx.xxx Bcastxx.xx.xxx.xxx Mask:255.255.255.0
inet6 addr: fe80::219:d1ff:fe6f:935f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:213 errors:0 dropped:0 overruns:0 frame:0
TX packets:59 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:23017 (22.4 KB) TX bytes:6935 (6.7 KB)

ab@ab-desktop:~$ ifdown eth0
ifdown: failed to open statefile /var/run/network/ifstate: Permission denied
ab@ab-desktop:~$ ifup eth0
ifup: failed to open statefile /var/run/network/ifstate: Permission denied
ab@ab-desktop:~$ sudo ifdown eth0
[sudo] password for ab:
ifdown: interface eth0 not configured
ab@ab-desktop:~$ sudo network-admin

(network-admin:6104): Gtk-WARNING **: Unknown property: GtkComboBox.items


** (network-admin:6104): CRITICAL **: Unable to lookup session information for process '6104'
ab@ab-desktop:~$ gksu network-admin
ab@ab-desktop:~$ lspci
00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02)
00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01)
00:1c.2 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 (rev 01)
00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 01)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 01)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 01)
00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family) SATA IDE Controller (rev 01)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01)
04:08.0 Ethernet controller: Intel Corporation PRO/100 VE Network Connection (rev 01)
ab@ab-desktop:~$

There is something I don't understand here - Ubuntu uses NetworkManager by default which means that you shouldn't see anything in /etc/network/interfaces apart from loopback.

Did you change the whole set-up then? If you did get rid of NetworkManager what exact steps did you take?

ya i did change it by executing command "sudo gedit /etc/network/interfaces" i deleted the lines which were as follows:
auto lo
iface lo inet loopback

i did it bcoz from network tool i was not able to select eth0 nor i was able to configure it. while configuring it i was getting error" the interface does not exist check that it is correctly typed"

have i done something wrong please guide me to establish the internet connection i am able to see in networks as windows network