Hi, I have a (working) instance of Koha 17.11.05-1 installed on an Ubuntu 18.01.1 LTS (bionic) machine. I would like to upgrade Koha to the current version 18.11.01-1, but I get the error: sudo apt upgrade koha-common Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: koha-common : Depends: libhttp-oai-perl (< 4.0) but 4.06-1 is to be installed or libhttp-oai-3.27-perl but it is not going to be installed E: Broken packages Any hint on how to resolve my problem? Many thanks in advance and best regards, Giuseppe.