Same problem for my Lenovo. It seems to be something related to the Ethernet hardware power management.
You need to install a new driver.
sudo apt install linux-headers-generic build-essential git
git clone https://github.com/lwfinger/rtlwifi_new.git
sudo make install
What I do is to run the command
$ nmcli connection show
NAME UUID TYPE DEVICE
Wired1 49b2a5bb-3104-4d4d-a2d6-ec39d3d7c75c 802-3-ethernet enp0s25
Wireless1 420a1462-c582-430c-9acc-a326b900f8e5 802-11-wireless wlp3s0
It will show which connections are active. Then, if I want to switch my wired ...
With Ubuntu 16.10 on the XPS 9550 I have the same trouble. Running the following command after opening the lid fixes the problem for me. There should be no need to log out and log back in after running the command.
sudo service network-manager restart
The Ubuntu documentation seems to say the source of the problem lies in the driver.
The problem is in the kernel, whilst version 3.19 supports the Intel 8260 driver it does not contain native support which as you've found means a lot of messing around. I'm told that Kernel v4.2 onwards does support it natively. Newer kernels are available in the standard repos. Wily is v4.2 and Xenial is v4.4. So:
sudo apt-get install linux-image-generic-...
I don't think you can do this within Firefox. If you do a 'firefox --help' on the command line there is no switch to specify a specific network interface.
You could work around that by creating a local proxy for one of the interfaces and use a custom profile for that one instance of Firefox and point it at the your new local proxy inside the profile.
Personally, i have achieved something like that. I used my laptop to pick up the wifi. Then, used the ethernet on the laptop to run to my xp desktop. the trick to it is one of the wifi connections has to be shared if i can remember right its the ethernet port. This can all be done by
-clicking the wifi symbol
-then at the bottom there's a ...
Forget about that. Just download the .deb file from here and then install it on the other pc with sudo apt install ./r8168*.deb
That version is for Loki only. If you decide to use Juno you'd need to download this version
In turns out windows 10 wasn't 'letting go' of my NIC on shutdown, before booting into the Elementary live usb, so elementary couldn't connect to my router.
Switching off my PC by the PSU resolved it.
Ok, apparently after looking for some specs on the ethernet controller, some questions about similar motherboards on hardware forums and then some questions on the Ubuntu forums, I could narrow down the issue to the "forcedeth" driver, attributed to the nVidia nForce part of my motherboard (I assume it is some sort of I/O controller, as it also controls ...
Install both linux-firmware and linux-firmware-nonfree packages,e.g.
sudo apt-get install linux-firmware linux-firmware-nonfree
For me Installing newer drivers solved the problem from this article or you can go through this for your specific need.My WiFi adapter is not working at all, how to troubleshoot?
Specific problem with my blacklisted Broadcom driver. Ethernet connection working now thanks to solutions found in two askubuntu posts. I have no wifi adapter.
Ethernet Network card BCM4401-B0 no longer recognised? 1
How to Revive Wired Internet and Setup Wireless? 2
sudo modprobe b44 temporarily restored my connection. I then installed gedit to allow ...
Here is a crosspost to my answer on another question about this issue.
No ethernet connection
This guide may have give you a working solution:
Here is an archive of the article: