When my notebook was getting too slow I installed Ubuntu 13.10 also on my desktop. Initially the desktop worked fine but when I tried to connect to my modem the computer froze and since then I couldn connect to my modem anymore. I reinstalled Ubuntu and now I can connect to the modem by WLAN but not to the internet. Pings are answerd "with destination host unreachable". Both computers (notebook and desktop) are connected to the same modem a Friz!box 7340 via Wlan. When I compare the connection information on both computers only the IPv4 adres and the drivers differ. Yet the notebook connects and the desktop doesn't. What can be the problem?