I've recently installed Ubuntu 10.04. After installation I've updated the system:
sudo apt-get update and
sudo apt-get upgrade. Everything works fine but the Internet connection. It's a wireless connection. Sometimes I can't open any web page even if the connection applet shows "connected". I have to disconnect and connect once again; then it works till the next time it breaks.
Connection is fine, I don't have any problems with that on the other computer. It's also possible it's a hardware problem - the computer is quite old and haven't been used for long time.
Thanks for any suggestion!