Thanks for the hint, but didn't help.
Here the terminal output:
$ sudo rfkill unblock all
$ sudo rfkill list
0: acer-wireless: Wireless LAN
Soft blocked: no
Hard blocked: no
1: acer-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: acer-threeg: Wireless WAN
Soft blocked: no
Hard blocked: no
3: phy0: Wireless LAN
Soft blocked: no
Hard blocked: yes
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https://bugs.launchpad.net/bugs/822917
Title:
Wireless network in network-manager applet always shows device not
ready
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