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I installed Ubuntu Server 16.04 and when asked in installation which lan interface I would like to use as default, I chose my wlan. It worked during installation.

Now that the installation finished and I booted for the first time, wlan is not working. Wasn't this supposed to work out of the box since during installation I marked my wlan to be default, and it worked?

I know someone will just post how to configure the wlan (we have some older posts like Ubuntu 14.04 Server - WiFi WPA2 Personal that helps with the configuration or ubuntu server: wifi), but that's beside the point, what's the use of asking for a default lan interface when installing if after finishing the installation I need to manually open configuration files and reconfigure my wifi?

/etc/network/interfaces

Has only

source /etc/network/interfaces.d/* auto lo iface lo inet loopback

Going to /etc/network/interfaces.d/ (even as root) shows nothing.

And ifconfig

lo Link encap: Local Loopback inet addr: 127.0.0.1 Mas 255.0.0.0

Weren't these files supposed to have a configuration since I just installed Ubuntu Server?

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Somebody still uses you MS-DOS
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  • please edit your question to post the output of cat /etc/network/interfaces and ifconfig – fosslinux Jun 21 '16 at 05:20
  • @CollDue96 indeed it's just the loopback. – Somebody still uses you MS-DOS Jun 21 '16 at 05:26
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    I just installed Ubuntu server 16.04 i386 to an old Dell Dimension 2400 and had a similar experience. The installer made a successful wifi connection during install but fails after reboot.

    Instead of showing as 'wlan0' the attached USB dongle came up as 'wlxc83a35c69626' during install. Or some similar 'wlx............' string; preceding is what shows now via 'iwconfig' and via 'ls /sys/class/net'. Both of which now also show a second USB dongle I've since plugged in as 'wlx00e04c8191df'.

    '/etc/network/interfaces' and 'ifconfig' only show loopback.

     – kevjonesin Jun 29 '16 at 14:57
  • @kevjonesin yep, I had the same problem, not wlan0 but wsomething and just loopback. The manual lan config, actually, is simple/easy to set , but if it works when you installed, it should work out of the box after the installation finishes. I think we'll need to get in touch with someone from Ubuntu or even fill a bug report. – Somebody still uses you MS-DOS Jun 30 '16 at 22:33

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