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[Michael Lanczak <esddss@xxxxxxxxxxx>]

I want something give to mind and discussion referring to 'sudo' with 'su':
 
If you want to execute a securing backup of a complete drive or partition (so like sda...), then you need more time as a few seconds or minutes. (By the way, so you are able to restore your system and data if at example the harddisk is damaged and you must install a new harddisk.)
For that you need root authority, which you get only in terminal (or other possibility?) with the command 'su'. 
For a root-partition with 20 GB space you need for a backup roughly 13 minutes, for a home-partition more, for a complete drivecopy (Linux or Windows) roughly 90-180 minutes. 
This is fast and with success executable with the commands 
'dd if=/dev/SOURCE | gzip > BACKUP_PATH/image.gz' and
'gzip -dc /BACKUP_PATH/image.gz | dd of=/dev/SOURCE' for recovery.
The same is when you pack or unpack a lot of folders and data with 'tar[options][archiv][data]'. 
 
Here you can't need 'sudo', sudo has a time stamp with a time of validity of some minutes. You need here more time! 
So is the danger, that the copy or recovery performance with 'sudo su' breaks. Only using 'su' you get unlimited time for such operations with success.

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https://bugs.launchpad.net/bugs/1282597

Title:
  Ubuntu 13.10: Gnome-Terminal log in as su fails

Status in “ubuntu-docs” package in Ubuntu:
  Invalid

Bug description:
  Gnome-Terminal: If you try to log in as superuser with the order 'su' the input of any passwords fails.
  You are not able for using the Gnome-Terminal as superuser like the Ubuntu-version 12.04 LTS.

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