[Bug 1967237] Re: update-manager Dependencies missing

[Bral]

before hunspell-fr problem had errror message :
deb http://security.debian.org/deban-security stable/updates main has no release file
I found a solution (bad ?) to replace it with 
deb http://security.debian.org/debian-security stable-security/updates main

maybe the start of the problem and corruption of the update manager.
If so could it be repaired without reinstalling Ubuntu ?
Waiting for LTS 22.04 on 21/04 ?
Many thanks

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https://bugs.launchpad.net/bugs/1967237

Title:
  update-manager Dependencies missing

Status in update-manager package in Ubuntu:
  New

Bug description:
  E:Erreur, pkgProblem::Resolve a généré des ruptures, ce qui a pu être
  causé par les paquets devant être gardés en l'état.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: update-manager 1:20.04.10.10
  ProcVersionSignature: Ubuntu 5.4.0-105.119-lowlatency 5.4.174
  Uname: Linux 5.4.0-105-lowlatency x86_64
  ApportVersion: 2.20.11-0ubuntu27.21
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: XFCE
  Date: Thu Mar 31 09:32:14 2022
  InstallationDate: Installed on 2020-09-15 (561 days ago)
  InstallationMedia: Ubuntu-Studio 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=fr_BE:fr
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_BE.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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