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I'm newbie to Ubuntu and I'm using Ubuntu 14.04 (dual booted with Windows 7). Last few days it was working fine but from today my problem as follow as,

FIREFOX NOT WORKING IN UBUNTU

  • Note: I had firefox only. Not anymore chrome etc...

Its says only,

SERVER NOT FOUND

But I don't see any network connecting problem in Windows 7

Note:

1. using Ethernet.
2. No proxey.
3. Manual method.
4. IPv4 settings.  
5. Wired connection.

update:

ip         -> 198.168.20.93   
netmask    -> 255.255.255.0   
gateway    ->198.168.20.14
dnsserver  ->198.168.20.14

How can I resolve my internet issue?

UPDATE 1:

ubuntu@P3-SD1:~$ ifconfig

eth0      Link encap:Ethernet  HWaddr 00:1c:c0:80:19:d3  
          inet addr:198.168.20.93  Bcast:198.168.20.255  Mask:255.255.255.0
          inet6 addr: fe80::21c:c0ff:fe80:19d3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:157600 errors:1865 dropped:2455 overruns:0 frame:1865
          TX packets:6437 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:12506428 (12.5 MB)  TX bytes:349342 (349.3 KB)

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:65536  Metric:1
          RX packets:11260 errors:0 dropped:0 overruns:0 frame:0
          TX packets:11260 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:897196 (897.1 KB)  TX bytes:897196 (897.1 KB)

ubuntu@P3-SD1:~$ route -n

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         198.168.20.14   0.0.0.0         UG    0      0        0 eth0
198.168.20.0    0.0.0.0         255.255.255.0   U     1      0        0 eth0

ubuntu@P3-SD1:~$ cat /etc/resolv.conf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1

ubuntu@P3-SD1:~$ ping www.google.com

ping: unknown host www.google.com

UPDATE 2:

ubuntu@P3-SD1:~$ cat /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
RGK
  • 63

3 Answers3

2

I suppose that these addresses starting with 198 are wrong. Try to enter 192 instead of 198.

user300458
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switch the values of gateway and netmask (are these the same as in windows?).

ip        -> 198.168.20.93
netmask   -> 255.255.255.0 
gateway   -> 198.168.20.01 (router address)
dnsserver -> 198.168.20.01 (router address, also try 8.8.8.8)

Have you tried Automatic (DHCP)?

Goksu
  • 299
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Finally user300458 finding right one:

ubuntu@P3-SD1:~$ cat /etc/resolv.conf

but @AzkerM telling some use full and some change with got the solution,

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1

ubuntu@P3-SD1:~$ cat /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)
auto eth0
iface eth0 inet loopback
Community
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RGK
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