Dear sir, I am unable to fix the error "unable to locate the Koha-common Please see the output of three commands 1. cat /etc/apt/sources.list.d/koha.list root@cohklib-HP-Z230-SFF-Workstation:/home/cohklib# 2) wget -O- http://debian.koha-community.org/koha/gpg.asc | sudo apt-key add - root@cohklib-HP-Z230-SFF-Workstation:/home/cohklib# add - 3) sudo apt-get update Ign http://in.archive.ubuntu.com trusty/multiverse Translation-en_IN Ign http://in.archive.ubuntu.com trusty/restricted Translation-en_IN Ign http://in.archive.ubuntu.com trusty/universe Translation-en_IN Reading package lists... Done root@cohklib-HP-Z230-SFF-Workstation:/home/cohklib# -- Best regards Dr. Shankar Reddy Kolle Assistant Librarian (University of Horticultural Sciences, Bagalkot) College of Horticulture, Kolar Cell no.9742749018