screenletsd: 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/screenletsd - from package: screenlets

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

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