I am a beginner to Linux and Ubuntu, and my laptop currently dual-boots Ubuntu 12.04 and Windows 7. Neither of my wired and wireless connections are working. My wired network was working, but when I was searching for a solution to my wireless connection problem, it also stopped working. Not only did the wired connectioin stop working for Ubuntu, it also stopped working for Windows. :( I checked my LAN connection, and it seems fine - the cable was working fine seconds ago, and lights were flashing inside the port. It's worth noting that the computer repeatedly connects to the network - only to disconnect seconds later.
Anyway, from where I looked, the following information seems to be required:
ifconfig:
eth0 Link encap:Ethernet HWaddr f0:de:f1:65:74:d1
inet6 addr: fe80::f2de:f1ff:fe65:74d1/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:448 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:98250 (98.2 KB)
Interrupt:41 Base address:0x8000
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:631 errors:0 dropped:0 overruns:0 frame:0
TX packets:631 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:44610 (44.6 KB) TX bytes:44610 (44.6 KB)
wlan0 Link encap:Ethernet HWaddr 8c:a9:82:bd:5d:ac
inet6 addr: fe80::8ea9:82ff:febd:5dac/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:840 errors:0 dropped:0 overruns:0 frame:0
TX packets:936 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:349062 (349.0 KB) TX bytes:131132 (131.1 KB)
sudo lshw -C network:
*-network
description: Wireless interface
product: Centrino Wireless-N 1000
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlan0
version: 00
serial: 8c:a9:82:bd:5d:ac
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.2.0-32-generic firmware=39.31.5.1 build 35138 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:43 memory:d0500000-d0501fff
*-network
description: Ethernet interface
product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 05
serial: f0:de:f1:65:74:d1
size: 10Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8105e-1.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:41 ioport:2000(size=256) memory:d0404000-d0404fff memory:d0400000-d0403fff
I had tried using gksu gedit /etc/network/interfaces and adding
auto eth0
iface eth0 inet dhcp
But it didn't do anything.
EDIT: It turned out that this problem was caused by the bad university LAN - after a while, it magically started working again.
