TLDR
Enter a command. For example: opt, virsh pool build, adb install.

umount

 
Unlink a filesystem from its mount point, making it no longer accessible. A filesystem cannot be unmounted when it is busy. More information: https://manned.org/umount.8.
 
  • Unmount a filesystem, by passing the path to the source it is mounted from:
     
    umount {{path/to/device_file}}
     
  • Unmount a filesystem, by passing the path to the target where it is mounted:
     
    umount {{path/to/mounted_directory}}
     
  • Unmount all mounted filesystems (except the proc filesystem):
     
    umount -a

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