slimlock: 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/slimlock - from package: slim

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

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