LiveODM can't find XORRISO

[ponchi101]

Hello.
I am extremely new to this sector and I am trying to create a LIVEODM USB stick for simple mapping. However, while running it from UBUNTU 20.4, the terminal gives me this error:
ubuntu@ubuntu:~/LiveODM$ ./envsetup.sh
Ign:1 cdrom://Ubuntu 20.04.2.0 LTS Focal Fossa - Release amd64 (20210209.1) focal InRelease
Hit:2 cdrom://Ubuntu 20.04.2.0 LTS Focal Fossa - Release amd64 (20210209.1) focal Release
Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:5 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:6 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
205 packages can be upgraded. Run 'apt list --upgradable' to see them.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package xorriso is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'xorriso' has no installation candidate
END OF ERROR MESSAGE
I am not good enough to solve this issue as I am just a simple user, but it seems to me that XORISSO is no longer available to create the intended ISO.
Thanks for your help.

[DeepGeoTech]

I was able to get this to work by added another repository to sources.list .

deb http://mirrors.kernel.org/ubuntu/ focal main universe