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I have a wired connection in my student dorm room which doesn't come up in network-manager with 12.04. It does work with Windows 7 though, so it's not anything hardware related I would say.

On a spare partition on my HD I tried installing another 12.04,just to be sure it wasn't some configuration of mine being wrong: turns out, it doesn't work either.

The funny thing is that NM would recognize the connection until yesterday, so I thought some update had to with this,but there was nothing in the logs that seems to be able to break something network related.

My /etc/NetworkManager/NetworkManager.conf

[main]
plugins=ifupdown,keyfile
dns=dnsmasq

[ifupdown]
managed=false

My /etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
#iface eth0 inet dhcp

I don't know why the last line is commented, but I tried uncommenting it but it wouldn't work and even worse it would say "device unmanaged". I then tried setting managed=true but it went back to not recognizing the connection so I just rolled everything back.

ifconfig eth0 :

eth0      Link encap:Ethernet  HWaddr 00:26:9e:0a:2a:e3  
          UP 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:47 Base address:0xc000 

lshw -C network:

*-network
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: eth0
       version: 02
       serial: 00:26:9e:0a:2a:e3
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=N/A latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:47 ioport:5000(size=256) memory:d1010000-d1010fff memory:d1000000-d100ffff memory:d1020000-d102ffff

lspci:

03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)

/var/log/dpkg.log (just the part for yesterday,because yesterday connection worked):

2012-05-26 12:56:56 startup archives unpack
2012-05-26 12:57:11 upgrade libgnome-control-center1 1:3.4.1-0ubuntu2 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:11 status half-configured libgnome-control-center1 1:3.4.1-0ubuntu2
2012-05-26 12:57:12 status unpacked libgnome-control-center1 1:3.4.1-0ubuntu2
2012-05-26 12:57:12 status half-installed libgnome-control-center1 1:3.4.1-0ubuntu2
2012-05-26 12:57:12 status half-installed libgnome-control-center1 1:3.4.1-0ubuntu2
2012-05-26 12:57:12 status unpacked libgnome-control-center1 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:12 status unpacked libgnome-control-center1 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:12 upgrade gnome-control-center-data 1:3.4.1-0ubuntu2 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:12 status half-configured gnome-control-center-data 1:3.4.1-0ubuntu2
2012-05-26 12:57:12 status unpacked gnome-control-center-data 1:3.4.1-0ubuntu2
2012-05-26 12:57:13 status half-installed gnome-control-center-data 1:3.4.1-0ubuntu2
2012-05-26 12:57:13 status triggers-pending hicolor-icon-theme 0.12-1ubuntu2
2012-05-26 12:57:13 status half-installed gnome-control-center-data 1:3.4.1-0ubuntu2
2012-05-26 12:57:13 status half-installed gnome-control-center-data 1:3.4.1-0ubuntu2
2012-05-26 12:57:13 status unpacked gnome-control-center-data 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:14 status unpacked gnome-control-center-data 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:14 upgrade gnome-control-center 1:3.4.1-0ubuntu2 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:14 status half-configured gnome-control-center 1:3.4.1-0ubuntu2
2012-05-26 12:57:14 status unpacked gnome-control-center 1:3.4.1-0ubuntu2
2012-05-26 12:57:14 status half-installed gnome-control-center 1:3.4.1-0ubuntu2
2012-05-26 12:57:14 status triggers-pending man-db 2.6.1-2
2012-05-26 12:57:14 status half-installed gnome-control-center 1:3.4.1-0ubuntu2
2012-05-26 12:57:14 status triggers-pending bamfdaemon 0.2.118-0ubuntu0.1
2012-05-26 12:57:14 status half-installed gnome-control-center 1:3.4.1-0ubuntu2
2012-05-26 12:57:14 status triggers-pending desktop-file-utils 0.20-0ubuntu2
2012-05-26 12:57:14 status half-installed gnome-control-center 1:3.4.1-0ubuntu2
2012-05-26 12:57:15 status triggers-pending gnome-menus 3.4.0-0ubuntu1
2012-05-26 12:57:15 status half-installed gnome-control-center 1:3.4.1-0ubuntu2
2012-05-26 12:57:15 status half-installed gnome-control-center 1:3.4.1-0ubuntu2
2012-05-26 12:57:15 status unpacked gnome-control-center 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:15 status unpacked gnome-control-center 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:15 upgrade linux-libc-dev 3.2.0-24.39 3.2.0-25.40
2012-05-26 12:57:15 status half-configured linux-libc-dev 3.2.0-24.39
2012-05-26 12:57:16 status unpacked linux-libc-dev 3.2.0-24.39
2012-05-26 12:57:16 status half-installed linux-libc-dev 3.2.0-24.39
2012-05-26 12:57:17 status half-installed linux-libc-dev 3.2.0-24.39
2012-05-26 12:57:17 status unpacked linux-libc-dev 3.2.0-25.40
2012-05-26 12:57:18 status unpacked linux-libc-dev 3.2.0-25.40
2012-05-26 12:57:18 trigproc hicolor-icon-theme 0.12-1ubuntu2 0.12-1ubuntu2
2012-05-26 12:57:18 status half-configured hicolor-icon-theme 0.12-1ubuntu2
2012-05-26 12:57:26 status installed hicolor-icon-theme 0.12-1ubuntu2
2012-05-26 12:57:26 trigproc man-db 2.6.1-2 2.6.1-2
2012-05-26 12:57:26 status half-configured man-db 2.6.1-2
2012-05-26 12:57:28 status installed man-db 2.6.1-2
2012-05-26 12:57:28 trigproc bamfdaemon 0.2.118-0ubuntu0.1 0.2.118-0ubuntu0.1
2012-05-26 12:57:28 status half-configured bamfdaemon 0.2.118-0ubuntu0.1
2012-05-26 12:57:28 status installed bamfdaemon 0.2.118-0ubuntu0.1
2012-05-26 12:57:28 trigproc desktop-file-utils 0.20-0ubuntu2 0.20-0ubuntu2
2012-05-26 12:57:28 status half-configured desktop-file-utils 0.20-0ubuntu2
2012-05-26 12:57:28 status installed desktop-file-utils 0.20-0ubuntu2
2012-05-26 12:57:29 trigproc gnome-menus 3.4.0-0ubuntu1 3.4.0-0ubuntu1
2012-05-26 12:57:29 status half-configured gnome-menus 3.4.0-0ubuntu1
2012-05-26 12:57:29 status installed gnome-menus 3.4.0-0ubuntu1
2012-05-26 12:57:29 startup packages configure
2012-05-26 12:57:29 configure libgnome-control-center1 1:3.4.2-0ubuntu0.2 <none>
2012-05-26 12:57:29 status unpacked libgnome-control-center1 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:30 status half-configured libgnome-control-center1 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:30 status installed libgnome-control-center1 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:30 status triggers-pending libc-bin 2.15-0ubuntu10
2012-05-26 12:57:30 configure gnome-control-center-data 1:3.4.2-0ubuntu0.2 <none>
2012-05-26 12:57:30 status unpacked gnome-control-center-data 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:30 status unpacked gnome-control-center-data 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:30 status unpacked gnome-control-center-data 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:30 status half-configured gnome-control-center-data 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:30 status installed gnome-control-center-data 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:31 configure gnome-control-center 1:3.4.2-0ubuntu0.2 <none>
2012-05-26 12:57:31 status unpacked gnome-control-center 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:31 status half-configured gnome-control-center 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:31 status installed gnome-control-center 1:3.4.2-0ubuntu0.2
2012-05-26 12:57:31 configure linux-libc-dev 3.2.0-25.40 <none>
2012-05-26 12:57:31 status unpacked linux-libc-dev 3.2.0-25.40
2012-05-26 12:57:31 status half-configured linux-libc-dev 3.2.0-25.40
2012-05-26 12:57:31 status installed linux-libc-dev 3.2.0-25.40
2012-05-26 12:57:31 trigproc libc-bin 2.15-0ubuntu10 <none>
2012-05-26 12:57:31 status half-configured libc-bin 2.15-0ubuntu10
2012-05-26 12:57:32 status installed libc-bin 2.15-0ubuntu10
2012-05-26 15:15:55 startup archives unpack
2012-05-26 15:15:56 install linux-image-3.2.0-25-generic <none> 3.2.0-25.40
2012-05-26 15:15:56 status half-installed linux-image-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:16:06 status unpacked linux-image-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:16:06 status unpacked linux-image-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:16:06 upgrade linux-generic 3.2.0.24.26 3.2.0.25.27
2012-05-26 15:16:06 status half-configured linux-generic 3.2.0.24.26
2012-05-26 15:16:06 status unpacked linux-generic 3.2.0.24.26
2012-05-26 15:16:06 status half-installed linux-generic 3.2.0.24.26
2012-05-26 15:16:07 status half-installed linux-generic 3.2.0.24.26
2012-05-26 15:16:07 status unpacked linux-generic 3.2.0.25.27
2012-05-26 15:16:07 status unpacked linux-generic 3.2.0.25.27
2012-05-26 15:16:07 upgrade linux-image-generic 3.2.0.24.26 3.2.0.25.27
2012-05-26 15:16:07 status half-configured linux-image-generic 3.2.0.24.26
2012-05-26 15:16:07 status unpacked linux-image-generic 3.2.0.24.26
2012-05-26 15:16:07 status half-installed linux-image-generic 3.2.0.24.26
2012-05-26 15:16:07 status half-installed linux-image-generic 3.2.0.24.26
2012-05-26 15:16:07 status unpacked linux-image-generic 3.2.0.25.27
2012-05-26 15:16:08 status unpacked linux-image-generic 3.2.0.25.27
2012-05-26 15:16:08 install linux-headers-3.2.0-25 <none> 3.2.0-25.40
2012-05-26 15:16:08 status half-installed linux-headers-3.2.0-25 3.2.0-25.40
2012-05-26 15:16:18 status unpacked linux-headers-3.2.0-25 3.2.0-25.40
2012-05-26 15:16:18 status unpacked linux-headers-3.2.0-25 3.2.0-25.40
2012-05-26 15:16:18 install linux-headers-3.2.0-25-generic <none> 3.2.0-25.40
2012-05-26 15:16:18 status half-installed linux-headers-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:16:21 status unpacked linux-headers-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:16:21 status unpacked linux-headers-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:16:21 upgrade linux-headers-generic 3.2.0.24.26 3.2.0.25.27
2012-05-26 15:16:21 status half-configured linux-headers-generic 3.2.0.24.26
2012-05-26 15:16:21 status unpacked linux-headers-generic 3.2.0.24.26
2012-05-26 15:16:21 status half-installed linux-headers-generic 3.2.0.24.26
2012-05-26 15:16:21 status half-installed linux-headers-generic 3.2.0.24.26
2012-05-26 15:16:21 status unpacked linux-headers-generic 3.2.0.25.27
2012-05-26 15:16:21 status unpacked linux-headers-generic 3.2.0.25.27
2012-05-26 15:16:22 startup packages configure
2012-05-26 15:16:22 configure linux-image-3.2.0-25-generic 3.2.0-25.40 <none>
2012-05-26 15:16:22 status unpacked linux-image-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:16:22 status half-configured linux-image-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:17:02 status installed linux-image-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:17:02 configure linux-image-generic 3.2.0.25.27 <none>
2012-05-26 15:17:02 status unpacked linux-image-generic 3.2.0.25.27
2012-05-26 15:17:02 status half-configured linux-image-generic 3.2.0.25.27
2012-05-26 15:17:02 status installed linux-image-generic 3.2.0.25.27
2012-05-26 15:17:02 configure linux-generic 3.2.0.25.27 <none>
2012-05-26 15:17:02 status unpacked linux-generic 3.2.0.25.27
2012-05-26 15:17:02 status half-configured linux-generic 3.2.0.25.27
2012-05-26 15:17:03 status installed linux-generic 3.2.0.25.27
2012-05-26 15:17:03 configure linux-headers-3.2.0-25 3.2.0-25.40 <none>
2012-05-26 15:17:03 status unpacked linux-headers-3.2.0-25 3.2.0-25.40
2012-05-26 15:17:03 status half-configured linux-headers-3.2.0-25 3.2.0-25.40
2012-05-26 15:17:03 status installed linux-headers-3.2.0-25 3.2.0-25.40
2012-05-26 15:17:03 configure linux-headers-3.2.0-25-generic 3.2.0-25.40 <none>
2012-05-26 15:17:03 status unpacked linux-headers-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:17:03 status half-configured linux-headers-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:17:03 status installed linux-headers-3.2.0-25-generic 3.2.0-25.40
2012-05-26 15:17:04 configure linux-headers-generic 3.2.0.25.27 <none>
2012-05-26 15:17:04 status unpacked linux-headers-generic 3.2.0.25.27
2012-05-26 15:17:04 status half-configured linux-headers-generic 3.2.0.25.27
2012-05-26 15:17:04 status installed linux-headers-generic 3.2.0.25.27
2012-05-26 17:51:12 startup archives unpack
2012-05-26 17:51:12 install gir1.2-gucharmap-2.90 <none> 1:3.4.1.1-0ubuntu1
2012-05-26 17:51:12 status half-installed gir1.2-gucharmap-2.90 1:3.4.1.1-0ubuntu1
2012-05-26 17:51:12 status unpacked gir1.2-gucharmap-2.90 1:3.4.1.1-0ubuntu1
2012-05-26 17:51:12 status unpacked gir1.2-gucharmap-2.90 1:3.4.1.1-0ubuntu1
2012-05-26 17:51:13 install gedit-plugins <none> 3.3.4-0ubuntu1
2012-05-26 17:51:13 status half-installed gedit-plugins 3.3.4-0ubuntu1
2012-05-26 17:51:13 status triggers-pending libglib2.0-0:i386 2.32.1-0ubuntu2
2012-05-26 17:51:14 status half-installed gedit-plugins 3.3.4-0ubuntu1
2012-05-26 17:51:14 status triggers-pending libglib2.0-0 2.32.1-0ubuntu2
2012-05-26 17:51:14 status half-installed gedit-plugins 3.3.4-0ubuntu1
2012-05-26 17:51:14 status unpacked gedit-plugins 3.3.4-0ubuntu1
2012-05-26 17:51:14 status unpacked gedit-plugins 3.3.4-0ubuntu1
2012-05-26 17:51:14 trigproc libglib2.0-0:i386 2.32.1-0ubuntu2 2.32.1-0ubuntu2
2012-05-26 17:51:14 status half-configured libglib2.0-0:i386 2.32.1-0ubuntu2
2012-05-26 17:51:16 status installed libglib2.0-0:i386 2.32.1-0ubuntu2
2012-05-26 17:51:16 trigproc libglib2.0-0 2.32.1-0ubuntu2 2.32.1-0ubuntu2
2012-05-26 17:51:16 status half-configured libglib2.0-0 2.32.1-0ubuntu2
2012-05-26 17:51:16 status installed libglib2.0-0 2.32.1-0ubuntu2
2012-05-26 17:51:17 startup packages configure
2012-05-26 17:51:17 configure gir1.2-gucharmap-2.90 1:3.4.1.1-0ubuntu1 <none>
2012-05-26 17:51:17 status unpacked gir1.2-gucharmap-2.90 1:3.4.1.1-0ubuntu1
2012-05-26 17:51:17 status half-configured gir1.2-gucharmap-2.90 1:3.4.1.1-0ubuntu1
2012-05-26 17:51:17 status installed gir1.2-gucharmap-2.90 1:3.4.1.1-0ubuntu1
2012-05-26 17:51:17 configure gedit-plugins 3.3.4-0ubuntu1 <none>
2012-05-26 17:51:17 status unpacked gedit-plugins 3.3.4-0ubuntu1
2012-05-26 17:51:17 status half-configured gedit-plugins 3.3.4-0ubuntu1
2012-05-26 17:51:17 status installed gedit-plugins 3.3.4-0ubuntu1

Any idea?

share|improve this question
    
it's my student dorm's connection,so sadly i can't do anything..i will try asking my university for some help,but i'm not sure how good they know ubuntu (or if they know it at all..) –  uahug May 27 '12 at 21:09
    
it requires EAP-TLS authentication,using a certificate they provide,private key etc..IP is given via dhcp as far as i know.. The thing is,it worked up until yesterday..i added a pastebin link to my log file for yesterday,if you can see something it could have broken NM (i didn't find anything..) –  uahug May 27 '12 at 21:20
    
The thing is,the wired connection isn't even seen by ubuntu..it's like the cable was unplugged!probably it's not even a problem of the network's configuration,but some system/driver/network manager problem.. however,what info do you need? –  uahug May 27 '12 at 21:53
    
1)yes 2)noted 3)noted 4)yes ("polimi-protected 2" FYI) –  uahug May 27 '12 at 22:11
    
Also what is the output of sudo dhclient3 eth0 –  desgua May 27 '12 at 22:11
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closed as too localized by jokerdino, Bruno Pereira May 29 '12 at 7:55

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer

It turns out there were some problems with some cables and switches. So it's not Ubuntu's fault!

share|improve this answer
    
Thanks for letting us know. –  John S Gruber May 28 '12 at 20:30
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