etc/apt/apt.conf.d/99morecache

   1 // Local change by Matthijs, suggested by http://www.linuxquestions.org/questions/debian-26/dynamic-mmap-ran-out-of-room-error-when-adding-new-apt-source-list-233417/
   2 // Limit set to 16M
   3 APT::Cache-Limit "16777216";