kubuntu was working perfectly on my pc since i installed it. today i reboot my pc to go into wndows, then when i reboot back into kubuntu the internet doesn't work anymore. it works fine in windows and in debian sarge (where i am now) and on all the other pc's on our home network, but it all of a sudden refuses to work in kubuntu. it was working fine before that.

how do i fix this?

thanks

What do you mean by "doesn't work"? Do you get errors?

Also, please post the output of 'route' and 'ifconfig'.

not working as in when i open firefox i get a 'host page not found'. i've tried pinging the site, and using konqueror instead. i tried going to google, yahoo, msn, this site, etc. they all say 'host not found', just as if the internet were down (which is what i originally thought).

route:

jnev@jnevkubuntu:~$ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface

ifconfig:

jnev@jnevkubuntu:~$ ifconfig
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:56 errors:0 dropped:0 overruns:0 frame:0
TX packets:56 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4409 (4.3 KiB) TX bytes:4409 (4.3 KiB)

Well, it seems that you don't have any network interfaces configured. Are you using wired or wireless?

cable from road runner. but why did it just stop working all of a sudden? it was working fine this morning, then i went into windows for a few hours to do something, then when i came back to kubuntu it wasn't working...

Please attempt: 'dmesg | grep eth0'. Did you change any hardware or settings lately? Also, do 'ifconfig -a', please.

there have been no hardware changes at all. as i said, it worked this morning, then i had to work in windows for a few hours (internet wa working there too), then when i went back into kubuntu it stopped working.

jnev@jnevkubuntu:~$ dmesg | grep eth0
eth0: Identified chip type is 'RTL8169s/8110s'.
eth0: RTL8169 at 0xf8908000, 00:50:8d:ef:74:08, IRQ 16


jnev@jnevkubuntu:~$ ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:50:8D:EF:74:08
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 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:16 Base address:0x8000

eth1 Link encap:UNSPEC HWaddr 00-50-8D-00-00-EE-74-08-00-00-00-00-00-00-00-00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

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:56 errors:0 dropped:0 overruns:0 frame:0
TX packets:56 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4409 (4.3 KiB) TX bytes:4409 (4.3 KiB)

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

After an online chat with jnev, we determined that his /etc/network/interfaces needed the lines:
to cause the interface to come up via dhcp on boot.

Hope that helps others.