How can I uninstall ubuntu 12.04 LTS from my laptop and start again the installation from the scratch, i.e. by making the partition and soon staff. I made re-installation yesterday and ended up with a mess in the boot. The dual boot option is not available anymore. I made a boot repair and still couldn't get out of this problem. If it helps to give some advise, please, have a look to the link below for the boot information
http://paste.ubuntu.com/1350363/
one more question: Is it possible to delete some of the partitions that I have? if so, please let me know so that I will install ubuntu only in my laptop in one partion. Thank you