LibreOffice Base and unmet dependencies

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http://askubuntu.com – My database in LibreOffice Base is all of a sudden locked for editing. Moreover, LibreOffice Base exits whenever I try to insert a photo into a database post. I have worked in my relational database for months and have not made any changes to the design, only populated it. I have tried to remove LibreOffice Base in order to be able to install the software afresh. This is not possible through the Software Center. Here is the error message: installArchives() failed: dpkg: error processing libx11-6 (--configure): libx11-6:amd64 2: cannot be configured because libx11-6:i386 i (HowTos)