Err http://mirrors.dotsrc.org/ubuntu/ oneiric/universe ncdu i386 1.7-2
  404  Not Found
Failed to fetch http://mirrors.dotsrc.org/ubuntu/pool/universe/n/ncdu/ncdu_1.7-2_i386.deb  404  Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?