where is openvswitch-ipsec package

Did you download the deb files?

https://packages.ubuntu.com/search?keywords=openvswitch&searchon=names&suite=focal&section=all

Seems to be in the default repos. Have you tried these instead?

No.
That's my question - where are the deb files?
I search for them online, found few but not the openvswitch-ipsec_*.deb

Just run:

sudo apt install openvswitch-switch python3-openvswitch openvswitch-common

Should do it

It seems that a openvswitch-ipsec package does no more exist in Ubuntu releases 18.04 and later (was removed between version 2.6.1 and 2.7.0)

Which Ubuntu release are you running?

Yep, that's what I found also about "Ubuntu releases 18.04 and later"

I am using Ubuntu 20.04 LTS kernel 5.4.0-26-generic
when running "sudo apt install openvswitch..." I get:
openvswitch-switch is already the newest version (2.13.0-0ubuntu1).

this link is obsolete?
https://docs.openvswitch.org/en/latest/tutorials/ipsec/?highlight=ipsec

Is that mean that "Encrypt Open vSwitch Tunnels with IPsec" is no longer possible ??

Checking the openvswitch changelog in Debian https://metadata.ftp-master.debian.org/changelogs//main/o/openvswitch/openvswitch_2.15.0~git20210104.def6eb1ea+dfsg1-4_changelog shows for version 2.11.0+2019.06.25+git.9ebe795035+ds1-2

  * Reintroduce the openvswitch-ipsec package.

I do not know why Ubuntu did not follow Debian in that respect.

This might be a bug in Ubuntu packaging that should be reported accordingly.

found before:

openvswitch (2.8.1+dfsg1-5) unstable; urgency=medium
  * Removed deprecated openvswitch-ipsec (Closes: #887031).

so either its indeed obsolete and there is no replacement.
or should it be reported as bug? missing?

how to report?

You can start the process with:

ubuntu-bug openvswitch

Look at the history in Debian:

2.8.1 - Removed deprecated openvswitch-ipsec

2.11.0 - Reintroduce the openvswitch-ipsec package.

So it seems that it is no more deprecated but missing in Ubuntu.