I'm totally stuck with iptables and don't find the way to fix it. All started when I updated the kernel version:

1) When "ufw status", I get error

ERROR: problem running iptables: modprobe: ERROR: could not insert 'ip_tables': Exec format error
iptables v1.4.21: can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

2) When "modprobe ip_tables", I get:

modprobe: ERROR: could not insert 'ip_tables': Exec format error

3) I've upgraded to lastest available kernel in DigitalOcean: 3.16.0-23-generic

4) uname -r gets:

3.16.0-23-generic ; so it matches the kernel selected in DigitalOcean Control Panel

5) Have rebooted many times, to not result

Any idea on how to get this fixes is welcome.