Not applying iptables rules after ubuntu server update?

Question

linux

Yesterday I updated ubuntu server 10.04 -> 12.04
The update went well, everything worked, except for one thing - the iptables rules are not applied.
Those. Conclusion:
iptables -L
there is never a single rule. There are no error messages when trying to add a rule.
After the reboot, the first time I try to view the rule, I get an error:

iptables v1.4.12: can`t initialize iptables table 'filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

Subtracted what it can be if ip_tables is built as a module and can help:
modprobe -f ip_tables
But then I get a whack that the format of the ip_tables.ko module is not known.
Actually task: to
fix iptables. Or another way to pass the Internet through this computer - it acts as a gateway.
Thanks in advance.

Answer 1

iptables -L is most likely not being run as root, try sudo iptables -L

Answer 2

Try simply reinstalling the iptables and iptables-persistent packages.

Answer 3

Message about "can`t initialize iptables table 'filter'" only on the first attempt to add a rule?
On a booted system, can you add a rule from the console?
How do you start the rules at startup, through an if-up script?

Answer 4

modprobe iptable_filter

Answer 5

sudo /sbin/service iptables status
?

Answer 6

Check uname -r and /boot/ for the correct version
. I had the same error because I was booting from an old kernel