I'm having the same issue with libreoffice. I cannot upgrade it because it is looking for libc6 >= 2.19, which is unavailable. It appears it was compiled with libc6 at this version instead of the one available in debian (2.13-38+deb7u6). Perhaps we should contact the libreoffice maintainers? -- – Chris chris@cswenson.com cs.swenson@gmail.com