Ubuntu 15.04 Cannot Create a Network Connection

Asked by Jonecir Souza on 2016-07-27

I was trying to configure a VPN Connection. Some how I lost my current Network Configuration. After a few days researching, I could make my network work and also have internet access.

However, the network icon shows I'm disconnected and there's no network defined. If I tried to create on it does not work. If I click "Connection Information! it says:

"Error displaying connection information:
No valid active connections found!"

But, as I said, somehow I'm connected :-)

Clicking on the Network Icon, it also shows "Ethernet Netowork" disabled.

Here's some information about my system:

eth0 Link encap:Ethernet HWaddr c0:3f:d5:8f:89:f8
          inet addr: Bcast: Mask:
          RX packets:45642 errors:0 dropped:0 overruns:0 frame:0
          TX packets:28524 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:34088103 (34.0 MB) TX bytes:5364265 (5.3 MB)
          Interrupt:20 Memory:f7c00000-f7c20000

lo Link encap:Local Loopback
          inet addr: Mask:
          UP LOOPBACK RUNNING MTU:65536 Metric:1
          RX packets:249 errors:0 dropped:0 overruns:0 frame:0
          TX packets:249 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:553510 (553.5 KB) TX bytes:553510 (553.5 KB)

$ vi /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

iface eth0 inet static
# bridge_ports eth0

auto eth0
iface eth0 inet dhcp
  up ip link set $IFACE up promisc on
  down ip link set $IFACE down promisc off

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michael (yellupcm-gmail) said : #1

Please check this site.


15.04 is EOL. There is no support. 15.10 will be EOL tomorrow. Please do a new clean install of 16.04. This may correct your problem.

Jonecir Souza (jonecir) said : #2

Hi Michael, thanks for your prompt reply.

I have a lot of things already installed on my pc as I use it for development purposes. What happen if I make a new clean installation of 16.04? Is there a way I can upgrade to 16.04 without loosing all my work and other sw, packages, etc... I have installed?

Thanks again.

Jonecir Souza (jonecir) said : #3

Hi Michael,

I have Ubuntu 15.10 and not 15.04.

Going to Software Updater it says "The software on this computer is up to date. However, Ubuntu 16.04 LTS is now available (You have 15.10)." Then it shows the Upgrade button.

Again, what happens if I hit the Upgrade button? Will I loose all my data (MySql, PHP, Apache, etc...)?

I never did that.

michael (yellupcm-gmail) said : #4

Back up anything that is important to you. This is very, very important. I have not used the upgrade method, I always do a new install. That said, many people use the upgrade option, without trouble. I believe you can use upgrade without any problems. Backup anything that is important to you. Others can answer about upgrading experiences.

Jonecir Souza (jonecir) said : #5

Hey Michael,

Yes, for sure I can backup my important data (docs, projects, coding etc...).

But my main concern is if after upgrading I will have to reinstall all the applications I have already installed such as NetBeans IDE, Apache Server, MySQL, AbiWord, GIMP Image Editor, FileZila, Notepadd and many others.

Thanks a lot for your support.

Manfred Hampl (m-hampl) said : #7

Programs that you have already installed should stay available also after the release upgrade.

(The only exception would be packages that are no more available in the new release and where the dependencies are no more met in the new release. This is quite rare.)

Can you help with this problem?

Provide an answer of your own, or ask Jonecir Souza for more information if necessary.

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