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Old 05-31-2011, 07:40 PM   #1
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Can not connect to internet with Ubuntu 11.04

With help from another member I was finally able to get connected the the INTERNET via my wlan. I had always been able to connect with my Ethernet connection however today I can not get connected with either one. I can see both the wired and wireless connection but can not use either one. Any one have a suggestion?
Old 06-01-2011, 12:27 AM   #2
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What kind of changes have you made to your system before it stopped working? Have you confirmed your internet connection itself is operable? Also, could you explain more what you mean by "seeing" the connections, but they don't work? It sounds too bland; You will need to give us more details of your problem.


Old 06-01-2011, 10:56 AM   #3
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can you post the output of this:

1 members found this post helpful.
Old 06-01-2011, 09:05 PM   #4
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Can not connect to internet with Ubuntu 11.04

Hi hughedavid1,

Obvious questions... Notebook or Desktop, make and model, router make, model and Firmware version? Any changes you can remember before this happened? Did you check the obvious like the wires, the leds on the modem or router? Is your internet up and running according to your ISP? Ping results? Did you disable your firewall? Can anyone think of anything else? If possible, as wingman358 mentioned, could you post your results to ifconfig?

Old 06-02-2011, 01:54 AM   #5
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Hi hughedavid1

Have you tried rebooting with the 11.04 CD and seeing if the connection gets made? Personally, I think Ubuntu (and maybe the other Linux dists) are buggy when it comes to connecting to the internet. I have an ACER lap-top with a Broadcom card (IPN2220) and have never had Ubuntu (any version) make a connection to the internet with it. I have a Linksys Adapter card that plugs into an external slot (on the ACER) and that always makes a connection. I also have a Netgear Adapter 511 card that makes an initial connection (and does with 10.10 and 11.04 CDs). However, after some updates (via Update Manager), the Netgear 511 card will no longer make a connection. Even using ndiswrapper does not work (I also have a Netgear 111 USB adapter, which after a number of retries using ndiswrapper, was able to make a connection). I have re-installed Ubuntu a number of times and the install works clean with the NG 511 for a while, and then some update seems to blow it out of the water. I can see my router (Linksys WRT54G) but I can never make a connection after running for a month or two (and making regular updates when notified). I also have a TOshiba lap-top (no internal wireless card) and both the NG 511 and the Linksys card connect without a problem (as does the ethernet connection). However, only once was I able to get the NG 111 USB adapter to connect and that was back on Version 8.10. Of course, you could also have a H/W problem, but I have seen your problem posted here and elsewhere by others - it works for a while and then stops - so I find it difficult to think it is not an Ubuntu (or Linux) problem.

Good luck.
Bob C.
Old 06-02-2011, 12:24 PM   #6
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I have a similar problem in that I can boot into Ubuntu (well, actually Xubuntu because I really hate Unity), but in no time at all, the connection drops. At least as far as getting anything on a browser. The connection icon in the top right doesn't seem to notice that anything is wrong. Will try logging out and logging back in, except to the loathed Unity. This may or may not help.....
I know I have an internet connection, because it (almost) always works in Vista on the same machine.

Last edited by beep54; 06-02-2011 at 12:26 PM.
Old 06-03-2011, 02:20 AM   #7
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hughedavid1 said: I can see both the wired and wireless connection but can not use either one.

Where exactly do you "see" the connections? Can you try a livd cd of a different distro?

It would also be really helpful if you could enter a terminal and tell us the ouput of
which will return information on all configured interfaces.

this will return kernel messages regarding your ethernet card:
dmesg | grep eth
and the same but for your wireless card:
dmesg | grep wlan

Last edited by wingman358; 06-03-2011 at 02:29 AM.
Old 06-03-2011, 03:37 PM   #8
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Hi Hugh,

Try ping (local to your machine), then ping your ip. If thats ok check the nameserver to see if working something like
dig and see what you get..

You could also check your error log in /var/log and run: grep network messages
Old 06-09-2011, 02:46 PM   #9
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The things you're talking about seem to be Network Manager related problems (that small connection icon in the upper right corner you're talking about). It never works for me, so I just disable it in all my installations and resort to manually editing config files.

I never posted any questions about it, for I've just given up on this one. I just find out which programs and configuration files are responsible for each type of Internet connection and do it all manually from Gnome Terminal. I just accept it as a given that Network Manager is not a reliable way of configuring my network in Linux.

And yes, in Vista (or other MS Windows) things "just work" because manufacturers provide closed-source Windows drivers. So, before buying a piece of hardware I study how well it works under Linux. But that's unrelated to the Original Post.
Old 08-27-2012, 01:54 AM   #10
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Way late, but maybe it will help

I also have an Acer Travelmate 2301LCi. It also uses IPN2220 for wireless that works with Win XP but not Ubuntu. I believe it may have worked briefly (one bootup session only) with Ubuntu 8.10 or 9.04 and could never get it to work again. In all instances, I had to install using NDISWRAPPER (or ndisgtk - gui). NDISGTK shows it is installed, but no connection can be made. I can plug an Netgear 501 PCI card, using ndiswrapper or a Linksys PCI ard into the external PCI slot and they both work - the Linksys works without using ndiswrapper. I also have a Netgear 101 USB adapter and that works hit or miss depending upon the Ubuntu release, again installed using ndiswrapper.

I read on on one forum that the problem with Ubuntu and IPN2220 (and other Broadcom wireless adapters) is a bug in the kernel that has not been fixed since kernel 2.6.22. Of course, one of these days, the Broadcom H/W will be obsolete and the problem will go away when all H/W using it is in the landfill (or recycled).

I did find the Broadcom Download for the NIC 4401 Driver Downloads - and this site may also be helpful -,23012.html /,23870.html .

Last edited by bobc4012; 08-27-2012 at 02:54 AM. Reason: Added Broadcom site for Download


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