Debian Jessie Boot Single User Mode
How to Boot into Single User Mode on Debian 8 Jessie GNU/Linux – Step by step Tutorial.
And Startup Debian 8 into Single User Mode is Necessary whenever you Need to Create New Admin, Reset Root Pass or Make Any Admin Task in Runlevel 1.
Finally, for your Comfort this Guide is Split into several Pages to make it Easier to View and Follow every single Step involved.

1. Entering into GRUB Edit Mode
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On the GRUB Screen Hit ‘e‘: