[ubuntu] internet connection stopped working after update

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http://ubuntuforums.org – Hello, I`m having problems with my broadband connection. The computer can connect to my router and other computers in my network and all the other computers can access this computer. But I have no internet connection. If I change managed=false - > true in /etc/NetworkManager/nm-system-settings.conf I can get internet to work but I cannot asign a static IP and the computer is not visible in my home network so no other computer can access it. any kind of help appreciated !!! xxxxxxxxxxxxxx:~$ cat /etc/issue Ubuntu 10.04.4 LTS \n \l xxxxxxxxxxxx:~$ lsb_release -a No LSB modules a (Hardware)