Hi there, welcome to the forums, deepines 3.1 repository is only compatible with the latest deepin version 15.11based on Debian stable. Can you please verify for me which deepin version you have? Please follow these steps:
1-) Download the tool below
ANALIZADOR DE VERSIÓN PARA DEEPIN
0.64 KB 558 Descargas
2-) Move it to your desktop, then right click anywhere on your desktop and select "Open a terminal window here" (It might say different, I'm currently not running deepin in English), then run the following command by just copying and pasting into your terminal:
Then post the results here.
Gaming Edge AC LGA1151 Micro ATX Z390 Gaming Motherboard
CORSAIR CRYSTAL 280X RGB Micro-ATX Case Intel Core i7-8700K Desktop Processor at 4.7GHz Samsung UD590 Series, 28' 4K LED Monitor GeForce GTX 1080 8GB GDDR5X SLI (GTX 1080 ARMOR 8G OC) GPU 8-Channel (7.1) HD Audio with Nahimic 3 Boost Samsung - 970 EVO Plus 1TB (NVMe) SSD CORSAIR 32GB (2 x 16GB) Vengeance LPX DDR4 Deepin OS 15