About the drop of optimized packages, see: http://packages.debian.org/changelogs/pool/main/a/atlas/current/changelog#versionversion3.8.3-25
It is likely to be the same bug as: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=622082 ** Bug watch added: Debian Bug tracker #622082 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=622082 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/778217 Title: "illegal instruction" crash when solving least-squares problem -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs