Error while upgrading from 15.10 to 16.04 Beta 2

[wolfman]

What method did you use to update?:

How to upgrade Ubuntu (Mate) via the terminal

Hi all, this is for anyone who wants to use the terminal to fully update their current installed OS to the next available version, you just need to follow the next few steps and you can update directly without using the on-board update tool (Software Updater). First, make sure that your current software sources are set to your liking, making sure that the "Canonical" repositories are also active if you wish to also update any non-free software you might have installed such as Skype. Make sure…

See also:

Ubuntu Mate Update Guide

These are my own setting preferences, use at your own risk!. AN IMPORTANT NOTE FOR LINUX BEGINNERS. WHEN YOU ARE IN RECOVERY MODE, THE KEYBOARD DEFAULTS TO US ENGLISH, IF YOU HAVE ANY OTHER LANGUAGE KEYBOARD OTHER THAN US ENGLISH, WHEN YOU TYPE "Y" (FOR "YES"), IT MIGHT SHOW UP AS A DIFFERENT LETTER, ON MY KEYBOARD I MUST PRESS THE "Z" KEY WHICH EQUATES TO "Y" AS I HAVE A GERMAN KEYBOARD, JUST PRESS "BACKSPACE" AND HIT A DIFFERENT KEY UNTIL YOU SEE THE "Y" SHOW UP!. Click on "Subscribe…