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Much more information is needed. For starters:
Is this a boot or root or home partition or something else?
Is it on the local computer, an external device (if so, what type?), or over the network?
Is it in /etc/fstab or is it plug-and-play? If it's in fstab, what is the relevant entry in that file?
What does fdisk -l
report about the partition?
Did it ever work, then break, or has it never worked?
What distro/version of Linux?
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