SUMMARY
Cannot install julia backend for cantor.

STEPS TO REPRODUCE
1. Install cantor (apt install cantor...)
2. Attempt to install julia backend (apt install cantor-backend-julia)

OBSERVED RESULT

============
With pkcon:
============

Fatal error: The following packages have unmet dependencies:
  cantor-backend-julia: Depends: cantor (= 4:19.12.3-0ubuntu1) but 4:20.04.3-0xneon+20.04+focal+build4 is to be installed

==========
With apt:
==========

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) cantor-backend-julia:amd64 < none -> 4:19.12.3-0ubuntu1 @un puN Ib >
Broken cantor-backend-julia:amd64 Depends on cantor:amd64 < 4:20.04.3-0xneon+20.04+focal+build4 @ii mK > (= 4:19.12.3-0ubuntu1)
  Considering cantor:amd64 0 as a solution to cantor-backend-julia:amd64 9999
Broken cantor-backend-julia:amd64 Depends on libjulia1:amd64 < none | 1.4.1+dfsg-1 @un uH > (>= 0.7.0~beta2)
  Considering libjulia1:amd64 0 as a solution to cantor-backend-julia:amd64 9999
  Re-Instated libdsfmt-19937-1:amd64
  Re-Instated libopenlibm3:amd64
  Re-Instated libjulia1:amd64
Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 cantor-backend-julia : Depends: cantor (= 4:19.12.3-0ubuntu1) but 4:20.04.3-0xneon+20.04+focal+build4 is to be installed
E: Unable to correct problems, you have held broken packages.


EXPECTED RESULT

I can use the lovely julia in the lovely cantor :)


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon 5.19
KDE Plasma Version: 5.19.4
KDE Frameworks Version: 5.72.0
Qt Version: 5.14.2

ADDITIONAL INFORMATION

Happy to provide anymore information as is useful, not sure what parts of my environment will be useful.

Cheers