Hi, thanks a lot for your feedback. I understand you are on 17.11.06 and then try to upgrade to 18.05.00, is that correct? Narcis Garcia schrieb am 25.05.2018
*The following packages will be REMOVED:** ** koha-common libhttp-oai-perl*
This indicates there is a problem with libhttp-oai-perl. The version in Stretch (4.03) is broken. To provide the OAI functionality of Koha, there is a backported version libhttp-oai-3.27-perl for systems that ship libhttp-oai-perl 4.x. This version conflicts with the systems libhttp-oai-perl. However I can't reproduce the problem. On upgrade I get warnings, but libhttp-oai-3.27-perl is installed and Koha is upgraded. Could you share the output of apt-cache policy koha-common apt-cache policy libhttp-oai-perl apt-cache policy libhttp-oai-3.27-perl Cheers, Mirko