[Question] Possible bug in iptables?

Hello. I experience a strange iptables behaviour, described bellow. I would be happy for help in solving it or advises about the next steps to be taken.

**Description**

I attempted to add a global rule (without any assigned IP address) with following commands:

`iptables -t raw -A PREROUTING -m connntrack --ctstate NEW -j UPDATE`

or (when the above wasn't working):

`iptables -v -t raw -A PREROUTING -p tcp -j UPDATE`, where (in both cases) UPDATE is an created before custom chain.

Each time I receiving following output message:

* in the first case:

`UPDATE all opt -- in * out * 0.0.0.0/0 -> 0.0.0.0/0 ctstate NEW
iptables: No chain/target/match by that name.
`

* in the second case:

`UPDATE tcp opt -- in * out * 0.0.0.0/0 -> 0.0.0.0/0
iptables: No chain/target/match by that name.
`

**System informations:**

* OS: Ubuntu 20.04

* uname -a:

`Linux live 5.4.0-53-generic #59-Ubuntu SMP Wed Oct 21 09:38:44 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux`

* lsb_relaease -a:

`No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal
`