umount: /mnt: not mounted

umount: /mnt: not mounted是一个错误消息，意味着你尝试卸载一个并未挂载的设备或目录。这通常发生在以下两种情况下：
1. 你可能已经在之前的操作中卸载了该设备或目录。你可以使用df命令来检查是否已经成功卸载了该设备或目录。
2. 你可能没有正确挂载该设备或目录。在使用umount命令之前，请确保你已经使用mount命令正确地挂载了该设备或目录。你可以使用df命令来查看已经挂载的设备和目录列表。

请注意，umount命令只能用于已经被挂载的设备或目录，否则会出现"not mounted"的错误消息。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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