Hello, Mr. Sabih.
Thanks for your reply.
I tried what you have said several times in different ways, but nothing happened. Formerly (several days ago) it was possible to get some information when I wrote ifconfig wlan0 on the terminal. But now it says: wlan0: error fetching interface information: Device not found. Thus, even this basic information now is not possible. As to the adapter, when trying to connect it from the Devices menu, it says: failed to attach the USB device.
Last week I bought the LAN adapter you had advised: AWUS036ACH.