1. Enter the instruction
sudo nano /etc/apt/sources.list
2. Modify the source, comment with # or delete the original content directly, and add
deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi
#deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi
Press ctrl + o to save,
prompt whether to write, press Enter to confirm,
press ctrl + x to exit
3. Enter the update instruction
sudo apt-get update
Wait a moment
4. Enter the instructions to install the new version of vim
sudo apt-get install vim
Wait a moment