T4U not activated at start-up; network information incomplete after manual connection

version: 15.10 64bit

installed driver in "Additional Drivers"

every start-up the USB device is not used automatically (inactive);
must reconnect (unplug / plug in again) the USB device manually, then it is detected and used;
pop-up shows "You are now connected to >>"keines"<< ; this is German for "nothing", not the SSID name by the way

when working: the network information is not complete:

- panel icon network shows no connection to the used SSID
- connection speed is not displayed in pop-up "Network information" (translated window name from German "Verbindungsiormationen", sorry if this is not the exact name)

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: rtl8812au-dkms 4.3.8.12175.20140902+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Nov 2 12:10:10 2015
InstallationDate: Installed on 2015-10-26 (6 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: rtl8812au
UpgradeStatus: No upgrade log present (probably fresh install)