LibreOffice will not open files over NFS network using Kubuntu 14.04

When I try to open an odt file on a network server I always get an error message "document file “filename” is locked for editing by Unknown User. Open document read-only …

I am using LibreOffice with Kubuntu 14.04.3. There are no network problems with any other applications so it must be a problem with LibreOffice.

Is there a work around?

Caused by the presence of a lock-file, either in your personal Profile dir or the remote dir.

Does the answer here help?