slconsole: command not found

Have You tried accessing the binary with the full path?

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/slconsole - from package: sooperlooper

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