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Why are so many files marked with a lock here?. And I can't do anything on my flash drive, like copying, pasting, except for read file only.

Note : Many files that I have is using Indonesian language.

This is my USB drive configuration

This is my USB drive configuration, in sdb1 as FAT32

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    Is this flash drive used with Windows as well as in Ubuntu? Did you unplug it "safely"? Add these information in your answer. Also add a a screenshot of the app Disks in your question highlighting the flash drive on the left panel.
    – user68186
    Jul 3 at 15:42

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Why are so many files marked with a lock here? And I can't do anything on my flashdrive, like copying, pasting, except for read file only.

Because it is mounted as read-only or mounted with write enabled but not owned by you.

  • if the drive is ext4 you can do this from a terminal session if it is not owned by you:

    cd /media/muhammadhikamz/
    sudo chown -r $USER:$USER E16C-15FE
    
  • if the drive is formatted as NTFS you need to mount it with read/write and a couple of options. An example could be ...

    sudo mount -t ntfs -o nls=utf8,umask=0222 /dev/{device} /media/muhammadhikamz/E16C-15FE
    
    • -t vfat instead of -t ntfs if FAT
    • 0222 is read/write for owner, group, and others and is a reversed chmod permissions. Adjust as needed but do not use execute permissions (those are reserved for POSIX compliant filesystems; NTFS is not).
    • the utf-8 is likely not needed so you might want to omit it or if needed alter it for Indonesian support.

... and the locks will disappear.

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