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I try to establish a wifi connection with my router, however, it does not work, no matter what I try.

iwconfig gives:

lo no wireless extensions. wlan0 IEEE 802.11 ESSID:"A1A0"
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:off enp7s0 no wireless extensions.
.

I also tried to restart the network manager with sudo service network-manager stop and then sudo service network-manager start. It did not help either.

I also stopped the network manager and tried:

sudo iwconfig wlan0 essid $SSIDand sudo dhclient -v wlan0. It did not work that way.

lshw -C network gives: *-network Beschreibung: Kabellose Verbindung Produkt: RTL8723BE PCIe Wireless Network Adapter Hersteller: Realtek Semiconductor Co., Ltd. Konfiguration: broadcast=yes driver=rtl8723be driverversion=4.10.0-42-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11, so the driver is from Realtek (rtl8723be).

I also tried sudo apt-get install --reinstall bcmwl-kernel-source. No success.

Has anybody an idea, what I can try to wireless connect to my router?

Thank you in advance!!

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Make sure that you have the security settings correct. Unless you have the WPA2 password set, the wireless will never associate.

Ubuntu Server - How to connect to wireless WPA2 personal network? has further instruction.

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Maybe you use Vrtual Machine? I had the same problem when I was using Ubuntu in VMWare Player and when I installed Ubuntu GNU/Linux 16.04 lts as base system, problem solved...

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