Check each of the Kubuntu (and other distro if you can) bugs listed at and mark them as confirmed or unconfirmed.

https://wiki.documentfoundation.org/QA/BugTriage/HardBugs#Needs_.28possibly.29_specific_distro.2FDE

You will need a recent copy of Libreoffice and a recent install of Kubuntu

Ping Riddell or beluga on #libreoffice-qa channel on freenode IRC to ask questions.