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Essentially this:

Since I've done the upgrade to 18.04, I get these problems.

  1. Wifi connects/disconnects, mostly shows a ? no bars etc like I would expect. Although sometimes it does.

  2. Wired just basically refuses to connect, declares itself as un-managed.

Is there a handy way I can "start again" with setting up networking? I think that's the most obvious way to fix this.

Additional info from ifconfig: eth0: flags=4163 mtu 1500 ether d4:3d:7e:4a:11:9e txqueuelen 1000 (Ethernet) RX packets 250 bytes 65850 (65.8 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 28 bytes 3709 (3.7 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 31 base 0x9000

lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1000 (Local Loopback) RX packets 3959 bytes 406686 (406.6 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 3959 bytes 406686 (406.6 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlp2s5: flags=4163 mtu 1500 inet 192.168.1.14 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::a266:2594:4e53:324b prefixlen 64 scopeid 0x20 ether 00:16:b6:58:6a:2a txqueuelen 1000 (Ethernet) RX packets 3152 bytes 2130369 (2.1 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 3702 bytes 456293 (456.2 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

  • Go to /etc/Network Manager/NetworkManager.conf a) change managed =false to managed=true Go to /etc/network/interfaces a) Make sure the following lines are there with nothing else: auto lo iface lo inet loopback – walttheboss May 3 '18 at 3:55
  • Thanks, in part, I have wifi back. It's now down to wired, which just won't activate a connection. – Andrew May 5 '18 at 14:10
  • If it helps, the ethernet card is: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8168. I am thinking maybe the driver is not the right one. – Andrew May 5 '18 at 14:18
  • Looking at dmesg all I see is page faults. Namely dmesg | grep r816 [74324.723019] r8168 0000:01:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0002 address=0x0000000000000080 flags=0x0020] – Andrew May 5 '18 at 14:25

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