> Hi Uwe, > Uwe Brauer wrote: Hi Thanks for your answer > This network tool is tdenetworkmanager or something else? I assume yes. Yes it is. > You could turn off network manager and try configuring the wired network > manually or via network/interfaces. I tried this already, the problem is that in Kubuntu 14.04 things are different, maybe caused my the switch to systemd. In 10.4 and 12.04 I had in /etc a file resolv.conf which contained the IP of the DNS server and in /etc/network/interfaces The static IP of the machine, the gateway etc. Also the command sudo /etc/init.d/networking restart Restarted the network. Now in 14.04 resolv.conf -> ../run/resolvconf/resolv.conf Which seems ok, but sudo /etc/init.d/networking restart Seems not to do anything. In any case one problem is caused by the IPv6 protocol. So I added the following line to my grub configuration (/etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 quiet splash" And rebooted, then tdenetworkmanager seemed to configure the network correctly, but after rebooting the DNS server was deleted from resolv.conf again, which is annoying. Regards Uwe