Re: gksudo fail with every GUI programs (cannot open display)
The 'lts-quantal' files and backports are all part of the standard 12.04.2 installation to permit the use of the 3.5.0-xx kernal, in place of the 3.2.0-xx kernal still used in 12.04.1, and the updated version to 12.04.2.
DO NOT delete them!! nor uninstall them!!
"Better Solutions may bring Worsened Problems": After Lao Tse, b. circa 405BC. a contemporary of Confucius, who died circa 600BC.
They did things differently in those days, apparently!!