I just installed Xubuntu 8.04 dualboot with Windows XP, and am having problems connecting to the internet (no problem in XP).

I am not sure if I am missing a driver for my network card?

I searched the forum, and tried running sudo pppoeconf, and got the following error message:

Sorry, I scanned 2 interfaces, but the Access
Concentrator of your provider did not respond. Please
check your network and modem cables. Another reason
for the scan failure may also be another running pppoeprocess which controls the modem.
Output of lspci and ifconfig:

sisse@sisse-desktop:~$ lspci
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 735 Host (rev 01)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] Virtual PCI-to-PCI bridge (AGP)
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS85C503/5513 (LPC Bridge)
00:02.1 SMBus: Silicon Integrated Systems [SiS] SiS961/2 SMBus Controller
00:02.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 07)
00:02.3 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 07)
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev d0)
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] AC'97 Sound Controller (rev a0)
00:09.0 Ethernet controller: Davicom Semiconductor, Inc. 21x4x DEC-Tulip compatible 10/100 Ethernet (rev 31)
00:0b.0 Multimedia audio controller: Ensoniq 5880 AudioPCI (rev 02)
00:0d.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8029(AS)
01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2 MX/MX 400] (rev b2)
sisse@sisse-desktop:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:80:ad:00:9b:9e
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:5 Base address:0xd400

eth1 Link encap:Ethernet HWaddr 00:c0:26:11:41:b8
inet6 addr: fe80::2c0:26ff:fe11:41b8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:468 (468.0 B)
Interrupt:11 Base address:0xcc00

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:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:200 (200.0 B) TX bytes:200 (200.0 B)
Thank you in advance for any help you are able to give!