apt-listchanges: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/apt-listchanges - from package: apt-listchanges

You may install the required package with command apt-get install {package}

Error in other languages:
apt-listchanges: bevel nie gevind nie
apt-listchanges: comandă negăsită
apt-listchanges: comando não encontrado
apt-listchanges: commande introuvable
apt-listchanges: command not found
apt-listchanges: käsku ei ole
apt-listchanges: không tìm thấy lệnh
apt-listchanges: komanda nerasta
apt-listchanges: Kommando nicht gefunden.
apt-listchanges: kommandot finns inte
apt-listchanges: komut yok
apt-listchanges: nie znaleziono polecenia
apt-listchanges: níor aimsíodh an t-ordú
apt-listchanges: no se encontró la orden
apt-listchanges: no s'ha trobat l'ordre
apt-listchanges: opdracht niet gevonden
apt-listchanges: parancs nem található
apt-listchanges: perintah tidak ditemukan
apt-listchanges: príkaz nenájdený
apt-listchanges: příkaz nenalezen
apt-listchanges: команда не найдена
apt-listchanges: командата не е открита
apt-listchanges: 命令找不到
apt-listchanges: コマンドが見つかりません