kernel : linux-image-3.16.0-4-amd64

dmesg output :

[29203904.204752] ip6_tables: disagrees about version of symbol xt_compat_match_from_user
[29203904.204761] ip6_tables: Unknown symbol xt_compat_match_from_user (err -22)
[29203904.206552] ip6_tables: Unknown symbol xt_compat_check_entry_offsets (err 0)
[29203904.206617] ip6_tables: Unknown symbol xt_check_entry_offsets (err 0)
[29203904.206637] ip6_tables: Unknown symbol xt_copy_counters_from_user (err 0)
[29203910.877127] ip6_tables: disagrees about version of symbol xt_compat_match_from_user
[29203910.877133] ip6_tables: Unknown symbol xt_compat_match_from_user (err -22)
[29203910.877209] ip6_tables: Unknown symbol xt_compat_check_entry_offsets (err 0)
[29203910.877248] ip6_tables: Unknown symbol xt_check_entry_offsets (err 0)
[29203910.877267] ip6_tables: Unknown symbol xt_copy_counters_from_user (err 0)
[29203914.281423] ip6_tables: disagrees about version of symbol xt_compat_match_from_user
[29203914.281430] ip6_tables: Unknown symbol xt_compat_match_from_user (err -22)
[29203914.281508] ip6_tables: Unknown symbol xt_compat_check_entry_offsets (err 0)
[29203914.281548] ip6_tables: Unknown symbol xt_check_entry_offsets (err 0)
[29203914.281567] ip6_tables: Unknown symbol xt_copy_counters_from_user (err 0)

It appears this module is missing. 'iptables' works fine, the only issue is with 'ip6tables'