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I have a Ubuntu 12.04 on my Laptop and have the problem that since a few weeks I can't reach some Websites while others work fine. I'm sure that the Problem must be somewhere in my System, because in the Windows (same Laptop) everything works.

When I'm trying to reach one of those Sites I get redirected to the o2-search which tells me that the site couldn't be found. One of the sites which doesn't work is if this helps you.

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Can you give a few more details. Did ever work in ubuntu. are you using firefox or chrome? thanks – jmartin2279 Oct 16 '12 at 18:51
OK, I use the Firefox and yes it worked before in Ubuntu (and still does if I boot a Ubuntu-Live-CD) – Tobias Eisenhardt Oct 16 '12 at 18:57
Did you try other web browsers already? Which DNS server is entered in your settings? You can try to enter another DNS, for example (Google) in the network settings: – zerwas Oct 16 '12 at 19:15
changing the DNS-Server doesn't help, but using Chromium I can connext to the Sites. But then there is still the question why it doesn't work with the Firefox. – Tobias Eisenhardt Oct 16 '12 at 19:22
please write here your hardware – user84277 Oct 16 '12 at 20:40

My best Guess if your Firefox is corrupt. the easiest way to test this is to try another browser. go to and install chrome, or open your software center and get chromium. if you can access in either of those, your firefox is corrupt.

how to fix firefox:

in a terminal:

sudo apt-get purge firefox firefox-globalmenu firefox-gnome-support

this will uninstall FF, to reinstall:

sudo apt-get install firefox firefox-globalmenu firefox-gnome-support
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Youre solution looks obvious but doesn't solve anything. – Tobias Eisenhardt Oct 22 '12 at 17:06
it reinstalls firefox? – jmartin2279 Oct 23 '12 at 15:28
up vote 0 down vote accepted

I solved the problem now by myself.

Just creating a new userprofile for the firefox and everything works fine now.

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