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I installed ubuntu 16.04 on my laptop and, since the day I did, I've been having internet trouble. After connecting to any wi-fi network, I will have normal internet access for a little bit. However, after several minutes (sometimes seconds) I will lose all connection to the internet. I'll still be connected to the network (I've verified that I still can send and receive ARP packets). I've scoured forums looking for a solution but nothing works (including Internet keeps failing despite connected wifi on 16.04). The only relief I've found is to run

 sudo /etc/init.d/network-manager restart

However, this is a (very) temporary fix.

Daniel W.
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    If you run lspci in a terminal, you'll see a list of PCI devices, one of which should include your wifi adaptor. For example, mine is 03:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a). Can you please post this? – detly Jul 17 '17 at 00:01
  • 01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter

    02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)

     – Daniel W. Aug 01 '17 at 00:00
  • I am also sinking with the same problem Can anyone help me. SOS – vissu pepala Sep 15 '17 at 03:22
  • 01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter – Daniel W. Feb 01 '18 at 23:01
  • I'm also suffering from the same problem, except my connection can last for more than a couple of minutes. But still, every so often I have to reconnect to the same network to make it work again. – Peterson Silva Nov 23 '18 at 14:17

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