add repositories linux
 

how do i add repositories to deepin os

Read the "Question Guidelines"; putting your exact question into Google (or any search engine) pulls up a lot of pages with pictures and examples. Even the Deepin wiki has it:
https://wiki.deepin.org/wiki/Package_management

Always think twice before you add a new repository. All the packages in the official repositories have been carefully engineered to be mutually compatible. That's an important part of a distro developer's job. Non-standard repositories may contain different versions of libraries and other packages that will cause problems for you unless you know how to tell apt which repository to use for a given package (a process known as pinning).

I can remember several occasions on this forum where someone got into an awful mess because they had accumulated some non-standard repositories and accidentally created a "frankendebian".