A few days ago I installed Kubuntu 15.04 on my laptop. in first day I had no problem using WiFi at home but in my office I have no WiFi and I have to use a wired Ethernet cable to connect to the Internet and Kubuntu couldn't connect to wired connection! I searched and found this solution: adding two line of following commands to the /etc/network/interfaces file:

auto eth0
iface eth0 inet dhcp

and my problem with wired connection solved!

but a new problem was born! after this, my WiFi disconnects every time after a few minutes! and when I remove that code it will be OK!

can anyone tell me how I can have WiFi and wired Internet together?

  • you want to connect both wifi and ethernet to internet at the same time? – Ron May 6 '15 at 16:31
  • @Ron No! I want to connect to both of them separately! but without adding and removing that two lines of commands every time I switch between them – Mahdi Aryayi May 6 '15 at 16:37

You do not need to edit /etc/network/interfaces.

When you connect to a wired network, just disable wireless in Network Manager. And wired network card will receive an ip address by dhcp. It should work this way.

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