Hi, I was using koha 3.14.00.00 (installed via packages) on Ubuntu 12.04.4 LTS (GNU/Linux 3.5.0-49-generic i686) - on a Desktop System. and successfully upgraded koha to 3.16.00 yesterday (23-05-2014). After upgrade I was able to use koha staff client and opac without any problem. (while upgrading, it asked for - Rename the Apache Virtual hosts for koha Instance, the default was -"Yes", and I chose the same) But, when I try to open staff client/opac today, suddenly I get the error: 404 - The requested URL / was not found on this server. I tried clearing the cache/browsing history. then, re-started apache, it did not work. any other solutions could you recommend for understanding the problem? With Thanks Satish MV Librarian Govt. Engineering College, Hassan, Karnataka. India. --