kernel : linux-image-3.16.0-4-amd64

dmesg output :

[29203904.204752] ip6tables: disagrees about version of symbol xtcompatmatchfromuser
[29203904.204761] ip6tables: Unknown symbol xtcompatmatchfromuser (err -22)
[29203904.206552] ip6tables: Unknown symbol xtcompatcheckentryoffsets (err 0)
[29203904.206617] ip6tables: Unknown symbol xtcheckentryoffsets (err 0)
[29203904.206637] ip6tables: Unknown symbol xtcopycountersfromuser (err 0)
[29203910.877127] ip6tables: disagrees about version of symbol xtcompatmatchfromuser
[29203910.877133] ip6tables: Unknown symbol xtcompatmatchfromuser (err -22)
[29203910.877209] ip6tables: Unknown symbol xtcompatcheckentryoffsets (err 0)
[29203910.877248] ip6tables: Unknown symbol xtcheckentryoffsets (err 0)
[29203910.877267] ip6tables: Unknown symbol xtcopycountersfromuser (err 0)
[29203914.281423] ip6tables: disagrees about version of symbol xtcompatmatchfromuser
[29203914.281430] ip6tables: Unknown symbol xtcompatmatchfromuser (err -22)
[29203914.281508] ip6tables: Unknown symbol xtcompatcheckentryoffsets (err 0)
[29203914.281548] ip6tables: Unknown symbol xtcheckentryoffsets (err 0)
[29203914.281567] ip6tables: Unknown symbol xtcopycountersfromuser (err 0)

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