apticron: 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/sbin/apticron - from package: apticron

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

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