scl2trd: 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/scl2trd - from package: fuse-emulator-utils

You may install the required package with command apt-get install {package}
Error in other languages:
scl2trd: bevel nie gevind nie
scl2trd: comandă negăsită
scl2trd: comando não encontrado
scl2trd: commande introuvable
scl2trd: command not found
scl2trd: käsku ei ole
scl2trd: không tìm thấy lệnh
scl2trd: komanda nerasta
scl2trd: Kommando nicht gefunden.
scl2trd: kommandot finns inte
scl2trd: komut yok
scl2trd: nie znaleziono polecenia
scl2trd: níor aimsíodh an t-ordú
scl2trd: no se encontró la orden
scl2trd: no s'ha trobat l'ordre
scl2trd: opdracht niet gevonden
scl2trd: parancs nem található
scl2trd: perintah tidak ditemukan
scl2trd: príkaz nenájdený
scl2trd: příkaz nenalezen
scl2trd: команда не найдена
scl2trd: командата не е открита
scl2trd: 命令找不到
scl2trd: コマンドが見つかりません