Dear Ghosh Sir, Following method will work if your Koha version is older than current old stable version: To change present koha release to old stable, Open Koha sources list in any text editor like vi, leafpad, gedit. *gedit /etc/apt/sources.list.d/koha.list* Find which koha release mentioned. Delete the existing line and add following line, *echo deb http://debian.koha-community.org/koha <http://debian.koha-community.org/koha> oldstable main*Add the key in gpg.asc to your APT trusted keys *wget -O- http://debian.koha-community.org/koha/gpg.asc <http://debian.koha-community.org/koha/gpg.asc> | sudo apt-key add -* Update software sources *apt-get update* *apt-get upgrade* Regards, -- Vimal Kumar V. Technical Assistant Mahatma Gandhi University Library Kottayam, Kerala- 686 560 Web: http://www.vimalkumar.info Blog: http://linuxhalwa.blogspot.com http://kohageek.blogspot.in http://moovandan.blogspot.in --------------------------------------------------------------------------- "I forget what I was taught. I only remember what I have learnt" -Patrick White