Ytdyklly

I have been running Ubuntu 18.04 on a Lenovo Thinkpad T580 for the last ~3 months with no issues. Installed an update a few days ago, rebooted, and started having very odd issues for both wired and wireless connections.

I boot up the laptop and it connects to my home network successfully and I can access the internet. I disconnect from the network (close the lid or just turn off the connection) then reconnect. I am still on my home network and can see other devices, but no request resolves when I try to browse the internet, except if I go to www.google.com, that works! The only way to get back to normal is to reboot the laptop again.

Things I've tried:

• Pinging a well known IP address (8.8.8.8) to prove it is not a DNS issue, this fails.


• Run a service network-manager restart. This does not seem to have an effect.


• As above, I tested this on both wired and wireless and the same behavior occurs.


• I also tested this on my wireless hotspot which also behaved the same.


• Per other answers, looked at the dmsg logs and didn't see much.


• Tried Internet through different wifi does not work after sleep happens after Upgrade to 18.04 , did not seem to help either.

Here is my wireless info, but the problem feels more like a general network configuration.

~$ sudo lshw -class network

   *-network             

   description: Wireless interface

   product: Wireless 8265 / 8275

   vendor: Intel Corporation

   physical id: 0

   bus info: pci@0000:04:00.0

   logical name: wlp4s0

   version: 78

   serial: 04:d3:b0:7a:96:d0

   width: 64 bits

   clock: 33MHz

   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

   configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-43-generic firmware=34.0.1 ip=192.168.1.147 latency=0 link=yes multicast=yes wireless=IEEE 802.11

   resources: irq:147 memory:ec000000-ec001fff

  *-network

   description: Ethernet interface

   product: Ethernet Connection (4) I219-V

   vendor: Intel Corporation

   physical id: 1f.6

   bus info: pci@0000:00:1f.6

   logical name: enp0s31f6

   version: 21

   serial: 48:2a:e3:0f:9b:41

   capacity: 1Gbit/s

   width: 32 bits

   clock: 33MHz

   capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation

   configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.1-3 latency=0 link=no multicast=yes port=twisted pair

   resources: irq:145 memory:ec100000-ec11ffff

Thanks for any help.

I finally figured it out. A few days prior to the issues, I had configured a VPN using OpenVpn. I realized I had only been using it interactively through the terminal, but when I rebooted my laptop, it ran in the background as a daemon. The first time I disconnected, it never recovered and I was left in the state that I described.

I just turned the autoconnect in init.d to false, restarted, and everything works now.