T0msT0ne

etc/apt/sources.list - replace the content in this file with the content below marked between "++++" (backup the original content beforehand)

In etc/apt/sources.list.d/ there is a single file, move that from there (I moved it to my home folder in case I need to restore it)

run:

sudo apt-get update

sudo apt-get -y dist-upgrade  

The last command will prompt you some popups in the command line in which you need to select "Yes", "OK"...

This may take up to half an hour or more depending on your internet speed. If you run into errors try running the commands multiple times, but if the errors persist, I found that deleting the temporary packages will take care of the problem (I don't remember the folder they were in, let me know and I'll search again for them when I get home)

++++++++++++++++++++++++++++++++

deb http://ports.ubuntu.com/ubuntu-ports/ trusty main restricted

deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty main restricted

## Major bug fix updates produced after the final release of the

## distribution.

deb http://ports.ubuntu.com/ubuntu-ports/ trusty-updates main restricted

deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu

## team. Also, please note that software in universe WILL NOT receive any

## review or updates from the Ubuntu security team.

deb http://ports.ubuntu.com/ubuntu-ports/ trusty universe

deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty universe

deb http://ports.ubuntu.com/ubuntu-ports/ trusty-updates universe

deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 

## team, and may not be under a free licence. Please satisfy yourself as to 

## your rights to use the software. Also, please note that software in 

## multiverse WILL NOT receive any review or updates from the Ubuntu

## security team.

deb http://ports.ubuntu.com/ubuntu-ports/ trusty multiverse

deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty multiverse

deb http://ports.ubuntu.com/ubuntu-ports/ trusty-updates multiverse

deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty-updates multiverse

## N.B. software from this repository may not have been tested as

## extensively as that contained in the main release, although it includes

## newer versions of some applications which may provide useful features.

## Also, please note that software in backports WILL NOT receive any review

## or updates from the Ubuntu security team.

deb http://ports.ubuntu.com/ubuntu-ports/ trusty-backports main restricted universe multiverse

deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty-backports main restricted universe multiverse

deb http://ports.ubuntu.com/ubuntu-ports trusty-security main restricted

deb-src http://ports.ubuntu.com/ubuntu-ports trusty-security main restricted

deb http://ports.ubuntu.com/ubuntu-ports trusty-security universe

deb-src http://ports.ubuntu.com/ubuntu-ports trusty-security universe

deb http://ports.ubuntu.com/ubuntu-ports trusty-security multiverse