@robert-katzschmann:

Make sure wpa_cli is running:
# ps aux | grep wpa
/sbin/wpa_supplicant -s -B -P /run/wpa_supplicant.wlan0.pid -i wlan0 -W -D wext 
-c /etc/wpa_supplicant/wpa_supplicant.conf
/sbin/wpa_cli -B -P /run/wpa_action.wlan0.pid -i wlan0 -p 
/var/run/wpa_supplicant -a /sbin/wpa_action

If it is, then check /var/log/syslog - it should contain something like:
wpa_supplicant[11998]: wlan0: CTRL-EVENT-CONNECTED - Connection to 
18:1b:eb:b7:4a:27 completed [id=0 id_str=default]
wpa_action: WPA_IFACE=wlan0 WPA_ACTION=CONNECTED
wpa_action: WPA_ID=0 WPA_ID_STR=default WPA_CTRL_DIR=/var/run/wpa_supplicant
wpa_action: ifup wlan0=default
dhclient: Internet Systems Consortium DHCP Client 4.3.1

I'm guessing one or more of the above syslog messages will be missing
... knowing which messages are missing will help us determine the cause
of your problem.

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https://bugs.launchpad.net/bugs/1545302

Title:
  wpa-roam broken by fix for ifupdown #1337873

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