Becase the Deepin last version 20.2 used Qt library v5.15, it conflicts with some software compiled with different versions of Qt library. It is a problem to be solved.
Temporary solution for DDE native apps (Chinese language):https://bbs.deepin.org/en/post/218168
And some software not DDE native apps like vlc must be recompiled at this stage.
Or you can wait for the next upgrade to fix it.
more than half of my apps arent opening, computer, download,vlc, downloads, pictures kindly assist