Is a /proc mount necessary in /etc/fstab?
The claimed statement is generally true:
It is not necessary to list
/procand/sysin 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.
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This behavior is a bug in the installer package
partman-targetand was recently fixed in Debian Testing (wheezy) on June 15, 2012. - So, you can expect Ubuntu to "fix" this in 12.10...