@Paul - this bug report describes a specific library version conflict (Inkscape's bundled vs. MacPorts' installed libxml2 and libexslt) on OS X. Please file a separate report for your problem with Inkscape extensions when using the Ubuntu package so that it can be looked into accordingly.
@Paul - this bug report describes a specific library version conflict (Inkscape's bundled vs. MacPorts' installed libxml2 and libexslt) on OS X. Please file a separate report for your problem with Inkscape extensions when using the Ubuntu package so that it can be looked into accordingly.