Warning during update

Hello,

I'm a brand new Kali user (some user experience on ubuntu). I've tried to install Freedownloadmanager with the deb package provided on FDM website but since I have a warning during "sudo apt update" concerning Key issue for FDM. I purged the deb FDM package but still have the issue :

Code:

sudoapt update [sudo] Mot de passe de jean-martin : Atteint :1 https://repo.nordvpn.com//deb/nordvpn/debian stable InRelease Atteint :2 http://ftp.free.fr/pub/kali kali-rolling InRelease Atteint :3 https://debrepo.freedownloadmanager.org bionic InRelease Lecture des listes de paquets... Fait Construction de l'arbre des d?pendances... Fait Lecture des informations d'?tat... Fait 34 paquets peuvent ?tre mis ? jour. Ex?cutez ? apt list --upgradable ? pour les voir. W: https://debrepo.freedownloadmanager.org/dists/bionic/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.

I also cannot update /upgrade all packages :

Code:

sudoapt upgrade Lecture des listes de paquets... Fait Construction de l'arbre des d?pendances... Fait Lecture des informations d'?tat... Fait Calcul de la mise ? jour... Fait Les paquets suivants ont ?t? conserv?s : kde-cli-tools kde-cli-tools-data kde-config-screenlocker khotkeys khotkeys-data kscreen kwin-common kwin-data kwin-x11 libcolorcorrect5 libkf5screen-bin libkf5screen-data libkfontinst5 libkfontinstui5 libkscreenlocker5 libkwineffects14 libkwinglutils14 libkworkspace5-5 libnotificationmanager1 libplasma-geolocation-interface5 libpowerdevilcore2 libpowerdevilui5 libtaskmanager6abi1 libweather-ion7 pgcli php-common plasma-browser-integration plasma-desktop plasma-desktop-data plasma-workspace powerdevil powerdevil-data python3-pgspecial systemsettings 0 mis ? jour, 0 nouvellement install?s, 0 ? enlever et 34 non mis ? jour.

Sorry it is a french version of kali but it means that those packages are kept :

Code:

Les paquets suivants ont ?t? conserv?s : kde-cli-tools kde-cli-tools-data kde-config-screenlocker khotkeys khotkeys-data kscreen kwin-common kwin-data kwin-x11 libcolorcorrect5 libkf5screen-bin libkf5screen-data libkfontinst5 libkfontinstui5 libkscreenlocker5 libkwineffects14 libkwinglutils14 libkworkspace5-5 libnotificationmanager1 libplasma-geolocation-interface5 libpowerdevilcore2 libpowerdevilui5 libtaskmanager6abi1 libweather-ion7 pgcli php-common plasma-browser-integration plasma-desktop plasma-desktop-data plasma-workspace powerdevil powerdevil-data python3-pgspecial systemsettings 0 mis ? jour, 0 nouvellement install?s, 0 ? enlever et 34 non mis ? jour.

34 are not updated.

Before making mistakes I prefere to ask...

Thanks !