Hi,
Iam connected through ethernet card and ADSL modem. The internet works fine...but the problem is...on the top panel the "network manager" says "no network devices have been found" on left clicking it.

Yes, the internet works fine..no doubt about it...but why is this thing shown even though i have a network device??

Here are some outputs on the terminal:
Code:
diwas@diwas-desktop:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:18:46:01:4e:e3  
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::218:46ff:fe01:4ee3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4787 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5445 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:5149975 (4.9 MB)  TX bytes:860476 (840.3 KB)
          Interrupt:20 Memory:ff8ffc00-ff8ffcff 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1944 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1944 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:137925 (134.6 KB)  TX bytes:137925 (134.6 KB)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:10.1.56.40  P-t-P:10.1.0.1  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:4746 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5370 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:5042717 (4.8 MB)  TX bytes:734649 (717.4 KB)
Code:
diwas@diwas-desktop:~$ lspci
00:00.0 Host bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE DRAM Controller/Host-Hub Interface (rev 01)
00:02.0 VGA compatible controller: Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 01)
00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 81)
00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801DB (ICH4) IDE Controller (rev 01)
00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller (rev 01)
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
01:01.0 Ethernet controller: Hangzhou Silan Microelectronics Co., Ltd. RTL8139D [Realtek] PCI 10/100BaseTX ethernet adaptor (rev 01)
01:02.0 Modem: PCTel Inc HSP56 MicroModem (rev 04)