df Says, ``Cannot read table of mounted file systems.''" /> df Says, ``Cannot read table of mounted file systems.''" />
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   Linux FAQ > 10. Frequently Encountered Error Messages
Question:  10.14. df Says, ``Cannot read table of mounted file systems.''

There is probably something wrong with your /etc/mtab or /etc/fstab files. If you have a reasonably new version of mount, /etc/mtab should be emptied or deleted at boot time (in /etc/rc.local or /etc/rc.d/*), using something like

   $ rm -f /etc/mtab*

Some old Linux distributions have an entry for the root partition in /etc/mtab made in /etc/rc* by using rdev. That is incorrect—the newer versions of mount do this automatically.

Some old distributions also have a line in /etc/fstab that looks like:

   /dev/sdb1   /root   ext2   defaults

The entry for /root should read simply /.

This FAQ is from Linux Frequently Asked Questions with Answers, maintained by Robert Kiesling

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