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This ZFS guide claims:

The Ubuntu desktop installer may add dev, proc, sys, or tmp lines to the /etc/fstab file, but such entries are not strictly necessary for a modern system. Add them now if you want them.

How true is this? My Ubuntu 12.04 installation contains an explicit /proc mount. If it's unnecessary, why does Ubuntu include it?

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up vote 8 down vote accepted

The claimed statement is generally true:

It is not necessary to list /proc and /sys in the fstab unless some special options are needed. The boot system will always mount them. (Debian Wiki)

  • The only reason Debian (and by extension, Ubuntu) includes it is as a forgotten remnant of the bad old days when it used to be necessary.
  • This behavior is a bug in the installer package partman-target and was recently fixed in Debian Testing (wheezy) on June 15, 2012.
  • So, you can expect Ubuntu to "fix" this in 12.10...
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