[Koha] koha installation problem

hi,everybody i try to install koha ubuntu 14.04,but it does not work,first i make update then install the coha-common,and it's display the following error: reading Packages list ....................done building dependecy tree Reading information tree..............done E:unable to locate package Koha-common so please help me. regards. -- View this message in context: http://koha.1045719.n5.nabble.com/koha-installation-problem-tp5882926.html Sent from the Koha-general mailing list archive at Nabble.com.