I solved this by adding this ppa https://launchpad.net/~libreoffice/+archive/ubuntu/ppa. I don’t know if there is any other way. Maybe you should try first with this ppa https://launchpad.net/~libreoffice/+archive/ubuntu/libreoffice-5-1 for more stability if you are afraid that new versions of libreoffice might introduce new bugs (and if this doesn’t work then ppa purge it and add the first one).
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