I'm not sure where you have libvte4 0.13.5-0ubuntu2 from. I'm pretty sure that package has never been published for Dapper. Do you have any third party repositories enabled?
** Changed in: synaptic (Ubuntu) Status: Unconfirmed => Needs Info -- synaptic doesn't work; aptitude does https://launchpad.net/bugs/56877 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs