networking - Ubuntu Server 16.10 - WiFi Driver installation without internet - Ask Ubuntu

during installation of ubuntu, detected wireless adapter fine , able connect without problems. however, after installation, no longer detects wireless adapter.

first tried setting etc/network/interfaces:

auto lo iface lo inet loopback  auto wlan0 iface wlan0 inet static address 192.168.2.30 netmask 255.255.255.0 gateway 192.168.2.254 wpa-ssid idhere wpa-psk passhere dns-nameservers 8.8.8.8 192.168.2.254 

then tried changes:

sudo ifdown wlan0 && sudo ifup -v wlan0 

which resulted in:

wpa_supplicant: /sbin/wpa_supplicant daemon failed start

this didn't tell me tried:

sudo /etc/init.d/networking restart 

this resulted in error telling me run:

journalctl -xe 

and here got errors:

could not read interface wlan0 flags: no such device
wext: not set interface 'wlan0' up
wlan0: failed initialize driver interface

since wired connection not available me (broken port), started doing research on how install drivers original cd (which on usb in case). found question here:

how can install , download drivers without internet?

however, answer talks ubuntu 15.04. named directories no longer exist , couldn't find remotely simular on disk. after finding tons of google answer talking how ui or wired connection (which both aren't helpfull @ me), i'm truely @ loss , ask guys help.

earlier on, network interfaces assigned names in inconsistent way. if had 1 interface called eth0, , added another, first 1 might called eth1 of sudden. needed way give names network interfaces didn't depend on other interfaces being present, depended on hardware connection.

this provided version of systemd released few years back. called "predictable network interfaces names" (although "persistent" have been better qualification names not easy predict). interface name based on bios information, , name won't change until take out interface , e.g. put in different hardware slot.

your installation, @ point, suffers predictable interface names. wireless card had been called wlan0 years, has name. how can tell? do

sudo lshw -class network 

this show paragraph starting "*-network" , giving kinds of details wireless card (and paragraph wired interface). want @ "logical name". in case, has changed wlp3s0.

change name of interface in configuration files wlan0 wlp3s0, , you're done.