W: Failed to fetch http://ppa.launchpad.net/libreoffice...recise/Release
W: Some index files failed to download. They have been ignored, or old ones used instead.
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/planet76.com_repositories_._Packages
E: The package lists or status file could not be parsed or opened.
How do we fix this problem. It does not occur on our other PCs running 12.04 LTS.