Finally! I manage to upgrade my current Ubuntu to latest Ubuntu 14.10

Very frustrated at first...finally manage to do it correctly. This is the step I do.

Do run all this command in order.

1. PREPARATION

sudo apt-get clean

or,

sudo apt-get autoclean

sudo apt-get -f install

sudo dpkg --configure -a

sudo apt-get -f install
If the output is:

0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

That means it failed.

Next solution is to run:

sudo apt-get -u dist-upgrade

sudo apt-get -o Debug::pkgProblemResolver=yes dist-upgrade

All ok if output:
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

1. UPGRADE/INSTALLATION

sudo apt-get update && sudo apt-get dist-upgrade

sudo do-release-upgrade

References:
[1] http://askubuntu.com/questions/140246/how-do-i-resolve-unmet-dependencies-after-adding-a-ppa
[2] http://www.unixmen.com/upgrade-ubuntu-14-04-trusty-ubuntu-14-10-utopic/