Thank you for your suggestion
Also, I'm sorry reply late.
So I am not native English, I takes time to write.



>Ubuntu I believe uses a different network manager
I am aware network maneger is used in GUI environment, and, should not be 
used on the server without a GUI
Am I wrong?



>Try change auto wlan0  to allow-hotplug wlan0.
I changed
# auto wlan0
allow-hotplug wlan0

After that, I started wlan0
ifup wlan0

Message is displayed
RTNETLINK answers: File exists
Failed to bring up wlan0

wlan0 had started.
ifconfig
wlan0 Link encap: Ethernet HWaddr dc: fb: 02:59:1 d: 4e
          inet addr: 192.168.12.101 Bcast: 192.168.12.255 Mask: 
255.255.255.0
          inet6 addr: fe80 :: defb: 2ff: fe59: 1d4e/64 Scope: Link
          UP BROADCAST RUNNING MULTICAST MTU: 1500 Metric: 1
          RX packets: 1115 errors: 0 dropped: 0 overruns: 0 frame: 0
          TX packets: 33 errors: 0 dropped: 0 overruns: 0 carrier: 0
          collisions: 0 txqueuelen: 1000
          RX bytes: 163039 (163.0 KB) TX bytes: 6373 (6.3 KB)

However, like the previous, wifi unable to communicate. ping unreachable

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