apt-forktracer: 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-forktracer - from package: apt-forktracer

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

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