If you really intent to upgrade to 5.1.0 you are currently advised to use https://launchpad.net/~libreoffice/+archive/ubuntu/libreoffice-5-1 which contains builds for trusty and wily already.
I would like to give it some more testing before putting it up in the main ppa. ** Changed in: libreoffice (Ubuntu) Status: New => Opinion -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1545901 Title: ppa:libreoffice/ppa remains on Still To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1545901/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs