sudo: /etc/sudoers.d/nicky is mode 0644, should be 0440
>>> /etc/sudoers.d/README: /etc/sudoers.d/nicky near line 18 <<<
sudo: parse error in /etc/sudoers.d/README near line 18
sudo: no valid sudoers sources found, quitting
*** glibc detected *** sudo: double free or corruption (!prev): 0x00000000007b1830 ***
======= Backtrace: =========
/lib/libc.so.6(+0x78b06)[0x7f7b11a01b06]
/lib/libc.so.6(cfree+0x73)[0x7f7b11a083d3]
/lib/libc.so.6(fclose+0x14d)[0x7f7b119f200d]
sudo[0x41117b]
sudo[0x412206]
sudo[0x40fd74]
sudo[0x413b0e]
/lib/libc.so.6(__libc_start_main+0xfd)[0x7f7b119a7c4d]
sudo[0x403739]
======= Memory map: ========
00400000-00422000 r-xp 00000000 08:02 674452                             /usr/bin/sudo
00621000-00622000 r--p 00021000 08:02 674452                             /usr/bin/sudo
00622000-00624000 rw-p 00022000 08:02 674452                             /usr/bin/sudo
00624000-00627000 rw-p 00000000 00:00 0 
007ac000-007cd000 rw-p 00000000 00:00 0                                  [heap]
7f7b0c000000-7f7b0c021000 rw-p 00000000 00:00 0 
7f7b0c021000-7f7b10000000 ---p 00000000 00:00 0 
7f7b10cfe000-7f7b10d14000 r-xp 00000000 08:02 783602                     /lib/libgcc_s.so.1
7f7b10d14000-7f7b10f13000 ---p 00016000 08:02 783602                     /lib/libgcc_s.so.1
7f7b10f13000-7f7b10f14000 r--p 00015000 08:02 783602                     /lib/libgcc_s.so.1
7f7b10f14000-7f7b10f15000 rw-p 00016000 08:02 783602                     /lib/libgcc_s.so.1
7f7b10f15000-7f7b10f21000 r-xp 00000000 08:02 799354                     /lib/libnss_files-2.11.1.so
7f7b10f21000-7f7b11120000 ---p 0000c000 08:02 799354                     /lib/libnss_files-2.11.1.so
7f7b11120000-7f7b11121000 r--p 0000b000 08:02 799354                     /lib/libnss_files-2.11.1.so
7f7b11121000-7f7b11122000 rw-p 0000c000 08:02 799354                     /lib/libnss_files-2.11.1.so
7f7b11122000-7f7b1112c000 r-xp 00000000 08:02 799347                     /lib/libnss_nis-2.11.1.so
7f7b1112c000-7f7b1132b000 ---p 0000a000 08:02 799347                     /lib/libnss_nis-2.11.1.so
7f7b1132b000-7f7b1132c000 r--p 00009000 08:02 799347                     /lib/libnss_nis-2.11.1.so
7f7b1132c000-7f7b1132d000 rw-p 0000a000 08:02 799347                     /lib/libnss_nis-2.11.1.so
7f7b1132d000-7f7b11344000 r-xp 00000000 08:02 799342                     /lib/libnsl-2.11.1.so
7f7b11344000-7f7b11543000 ---p 00017000 08:02 799342                     /lib/libnsl-2.11.1.so
7f7b11543000-7f7b11544000 r--p 00016000 08:02 799342                     /lib/libnsl-2.11.1.so
7f7b11544000-7f7b11545000 rw-p 00017000 08:02 799342                     /lib/libnsl-2.11.1.so
7f7b11545000-7f7b11547000 rw-p 00000000 00:00 0 
7f7b11547000-7f7b1154f000 r-xp 00000000 08:02 793110                     /lib/libnss_compat-2.11.1.so
7f7b1154f000-7f7b1174e000 ---p 00008000 08:02 793110                     /lib/libnss_compat-2.11.1.so
7f7b1174e000-7f7b1174f000 r--p 00007000 08:02 793110                     /lib/libnss_compat-2.11.1.so
7f7b1174f000-7f7b11750000 rw-p 00008000 08:02 793110                     /lib/libnss_compat-2.11.1.so
7f7b11750000-7f7b11759000 r-xp 00000000 08:02 799353                     /lib/libcrypt-2.11.1.so
7f7b11759000-7f7b11959000 ---p 00009000 08:02 799353                     /lib/libcrypt-2.11.1.so
7f7b11959000-7f7b1195a000 r--p 00009000 08:02 799353                     /lib/libcrypt-2.11.1.so
7f7b1195a000-7f7b1195b000 rw-p 0000a000 08:02 799353                     /lib/libcrypt-2.11.1.so
7f7b1195b000-7f7b11989000 rw-p 00000000 00:00 0 
7f7b11989000-7f7b11b06000 r-xp 00000000 08:02 799350                     /lib/libc-2.11.1.so
7f7b11b06000-7f7b11d05000 ---p 0017d000 08:02 799350                     /lib/libc-2.11.1.so
7f7b11d05000-7f7b11d09000 r--p 0017c000 08:02 799350                     /lib/libc-2.11.1.so
7f7b11d09000-7f7b11d0a000 rw-p 00180000 08:02 799350                     /lib/libc-2.11.1.so
7f7b11d0a000-7f7b11d0f000 rw-p 00000000 00:00 0 
7f7b11d0f000-7f7b11d11000 r-xp 00000000 08:02 799355                     /lib/libdl-2.11.1.so
7f7b11d11000-7f7b11f11000 ---p 00002000 08:02 799355                     /lib/libdl-2.11.1.so
7f7b11f11000-7f7b11f12000 r--p 00002000 08:02 799355                     /lib/libdl-2.11.1.so
7f7b11f12000-7f7b11f13000 rw-p 00003000 08:02 799355                     /lib/libdl-2.11.1.so
7f7b11f13000-7f7b11f1f000 r-xp 00000000 08:02 783635                     /lib/libpam.so.0.82.2
7f7b11f1f000-7f7b1211e000 ---p 0000c000 08:02 783635                     /lib/libpam.so.0.82.2
7f7b1211e000-7f7b1211f000 r--p 0000b000 08:02 783635                     /lib/libpam.so.0.82.2
7f7b1211f000-7f7b12120000 rw-p 0000c000 08:02 783635                     /lib/libpam.so.0.82.2
7f7b12120000-7f7b12140000 r-xp 00000000 08:02 799352                     /lib/ld-2.11.1.so
7f7b12311000-7f7b12315000 rw-p 00000000 00:00 0 
7f7b1233d000-7f7b1233f000 rw-p 00000000 00:00 0 
7f7b1233f000-7f7b12340000 r--p 0001f000 08:02 799352                     /lib/ld-2.11.1.so
7f7b12340000-7f7b12341000 rw-p 00020000 08:02 799352                     /lib/ld-2.11.1.so
7f7b12341000-7f7b12342000 rw-p 00000000 00:00 0 
7fff71851000-7fff71866000 rw-p 00000000 00:00 0                          [stack]
7fff7190d000-7fff7190e000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
Aborted