Setting up elasticsearch (5.1.1) ...
Couldn't write '65536' to 'vm/mmap_min_addr', ignoring: Permission denied
Couldn't write '176' to 'kernel/sysrq', ignoring: Permission denied
Couldn't write '262144' to 'vm/max_map_count', ignoring: Permission denied
Couldn't write '1' to 'fs/protected_symlinks', ignoring: Permission denied
Couldn't write '4 4 1 7' to 'kernel/printk', ignoring: Permission denied
Couldn't write '1' to 'kernel/kptr_restrict', ignoring: Permission denied
Couldn't write '1' to 'kernel/yama/ptrace_scope', ignoring: Permission denied
Couldn't write '1' to 'fs/protected_hardlinks', ignoring: Permission denied
Couldn't write '1' to 'net/ipv4/tcp_syncookies', ignoring: No such file or directory
dpkg: error processing package elasticsearch (--configure):
 subprocess installed post-installation script returned error exit status 1