As a 'rule of thumb . . . I think this works in Ubuntu/Mint and Debian, when you can't file an App. or File go to the CLI (command line)
In a Terminal type > man find (this will give you the manual for the "find" application, that comes pre-installed.
To find a specific App or File, in a Terminal type > find <filename>
No need to use 'sudo' as you do not need to be a 'root' user for this.
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