You can activate the wlan by these commands instead of repluging:

sudo modprobe -r 8192eu
sudo modprobe 8192eu

You need change 8192eu to your own wlan name. If you don't know the name, search on google with keyword ID 148f:2070(your usb wlan's id which can be found by command lsusb).

Or you can just add the wlan name to /etc/modules:

sudo -i
echo 8192eu >> /etc/modules

Then the wlan will be activated automatically when system start.

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