I just happened to read http://xubuntu.org/news/xubuntu-16-04-lts- beta-1/ where is said:
Please note! No upgrade testing was undertaken during this milestone. There are issues currently when upgrading to Xenial Xerus. This release is not suitable for upgrading. :( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1553483 Title: Can't install 'xubuntu-core' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1553483/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
