I am new to Koha and have had the same issue on 3 different fresh Linux installs. I tried it with Debian 9, Ubuntu 18.04 and Ubuntu 16.04, all with the same problem. I followed the install instructions at https://wiki.koha-community.org/wiki/Koha_on_ubuntu_-_packages <https://wiki.koha-community.org/wiki/Koha_on_ubuntu_-_packages> No problem with the steps up to the install command but when issuing the sudo apt-get install koha-common I get the following: Reading package lists... Done Building dependency tree Reading state information... Done 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: libnet-oauth2-authorizationserver-perl but it is not going to be installed E: Unable to correct problems, you have held broken packages. I have tried installing linnet-oauth2-authorizationserver-perl separately but then I get this: The following packages have unmet dependencies: libnet-oauth2-authorizationserver-perl : Depends: libcryptx-perl (>= 0.021) but it is not installable E: Unable to correct problems, you have held broken packages. And then finally when trying to install libcryptx-perl I get: Package libcryptx-perl is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'libcryptx-perl' has no installation candidate My /etc/apt/sources.list.d/koha.list contains deb http://debian.koha-community.org/koha stable main If I change that stable to 17.11 then it will install that version but I am unable to get it to install with “stable” in the repository. Please let me know if you have any thoughts regarding this. Thank you, Michael Buhrley mwb@idi.edu