package/base-files/files/lib/upgrade/keep.d/base-files-essential

   1 # Essential files that will be always kept
   2 /etc/hosts
   3 /etc/inittab
   4 /etc/group
   5 /etc/passwd
   6 /etc/profile
   7 /etc/shadow
   8 /etc/shells
   9 /etc/sysctl.conf
  10 /etc/rc.local