Solve "qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in... Abandoned (core dumped)"

I tried a lot before and after, and finally solved the problem through this blog, comparing dishes, but I didn't understand how it was good.

(62 messages) Uuntu20.04 appears "qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in... Abandoned (core dumped)" problem solving record_eliminate BUG duck's blog-CSDN blog

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qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. | Qt Forum

(62 messages) "qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in ' 'even though it was found_Eliminate BUG Duck Blog-CSDN Blog