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    Please edit your question and add the output of the commands ls -ld /home/public, ls -ld /home/public/a_file_you _cannot_access and id executed as the user that has the problem. Commented Nov 16, 2020 at 11:27
  • If owner permissions denies the owner access, group permissions will not grant the owner access. Commented Nov 16, 2020 at 11:29
  • Please use set the setgid on the folder: chmod g+s /home/public to make all new files in that folder have the correct group id. Commented Nov 16, 2020 at 11:34
  • What is the exact error message you get when you try to open the file? Commented Nov 16, 2020 at 11:38
  • 2
    I wonder if it has anything to do with the lack of a filename suffix. If it's a PDF file, try giving the file a name that ends with .pdf. I don't know what your file manager tries to do when you double-click a file with no filename suffix. It may try to execute it. Commented Nov 16, 2020 at 12:00