How to upgrade Ubuntu 12.04 LTS to Ubuntu 14.04 LTS

****it maybe my laptop has problem because i cannot install wine on it

ubuntu software center This error could be caused by required additional software packages which are missing or not installable. Furthermore there could be a conflict between software packages which are not allowed to be installed at the same time.**

sudo apt-get install update-manager-core

Now if you could help me with my issue with going from 12.10 to 14.04 LTS. I made a huge mistake and installed 12.10 and now have no upgrade path.

The link below helped me https://smyl.es/how-to-fix-ubuntudebian-apt-get-404-not-found-package-repository-errors-saucy-raring-quantal-oneiric-natty/

The essence of it is that the software sources file must be updated with workable URLs then you can update to 13.04. Then run the process again to reach 13.10. Running a update process a third time will get to the latest LTS. Your milage may vary. These steps worked for me.

1. Update sources sudo sed -i -e ‘s/archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g’ /etc/apt/sources.list

2. Install the update manager sudo apt-get install update-manager-core

3. Do these next four steps in a loop until you reach the Ubuntu LTS version you want sudo apt-get update && sudo apt-get upgrade sudo reboot sudo do-release-upgrade sudo reboot

4. Remember to set the kernel version in the Digital Ocean console. You can view the kernels installed on your box in /lib/modules ls /lib/modules