sudo apt update
sudo apt install ibus-libpinyin
ibus restart

ibus-setup

Perform manipulation in the pop-up window

After entering the above command, a window named “IBus Preferences” will appear:

1. Click the Input Method (输入法) tab at the top.
2. Click the Add (添加) button on the right side.
3. In the list, select sequentially: Chinese (中文) -> Intelligent Pinyin (智能拼音) -> Add (添加).