If it is a graphical interface, you can check the status of your input method;
If it is a text interface, the password is not displayed when entering the password. After you enter the correct password, just press the enter key.

Due to insufficient space there's no real-time clock. There are two sets of I2C pin headers reserved, and an RTC clock module can be connected by yourself.

(1) Back up the original file (optional step)
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
(2) Open the /ect/apt/sources.list file, comment or delete the existing software source, and then add the software source you need.
(3) Update: sudo apt-get update

(1) Run command sudo apt install usbutils to get lsusb command
(2) Test the USB interface. For example, after you connect a USB mouse, execute lsusb to check if there is a mouse connected.
(3) The peripherals cannot be identified. It is recommended to check whether other devices can be identified normally.

In Settings-Power, there is the "blank screen" option.

(1)Turn on the power of the wireless network card
iwconfig wlan0 txpower on
The signal light of the wireless network should be on.
(2)List wireless networks in the area
iwlist wlan0 scan
(3)Assuming you want to connect to the network MyHome MyHome (essid is MyHom), then enter the command
iwconfig wlan0 essid "MyHome"
If the network is encrypted and the password is 0123456789, then enter the command
iwconfig wlan0 essid "MyHome" key 0123-4567-89

Please check whether the ip address is the same with the ip address on the board!
Please check whether the ip address on window 10 has the same network segment with the IP address on DEBIX

Use root to log in and then run /usr/sbin/sndconfig, and you will see the interface for selecting sound card types. Generally you can select Sound Blaster. After selection you need to set relevant resources, in this process you can use TAB key and direction keys to make selections and then press OK. If you hear the voice of Linus (the founder of Linux), it means that the sound card is set up successfully.

(1)Install JDK
sudo apt-get update
sudo apt-get install openjdk-8-jdk
(2)Run the file
java -jar file name.jar

Setting Interface: settings - Region & Language - Manage Installed Languages - select Chinese - click Restart