qemu-mipsn32el: 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/qemu-mipsn32el - from package: qemu-user

You may install the required package with command apt-get install {package}
Error in other languages:
qemu-mipsn32el: bevel nie gevind nie
qemu-mipsn32el: comandă negăsită
qemu-mipsn32el: comando não encontrado
qemu-mipsn32el: commande introuvable
qemu-mipsn32el: command not found
qemu-mipsn32el: käsku ei ole
qemu-mipsn32el: không tìm thấy lệnh
qemu-mipsn32el: komanda nerasta
qemu-mipsn32el: Kommando nicht gefunden.
qemu-mipsn32el: kommandot finns inte
qemu-mipsn32el: komut yok
qemu-mipsn32el: nie znaleziono polecenia
qemu-mipsn32el: níor aimsíodh an t-ordú
qemu-mipsn32el: no se encontró la orden
qemu-mipsn32el: no s'ha trobat l'ordre
qemu-mipsn32el: opdracht niet gevonden
qemu-mipsn32el: parancs nem található
qemu-mipsn32el: perintah tidak ditemukan
qemu-mipsn32el: príkaz nenájdený
qemu-mipsn32el: příkaz nenalezen
qemu-mipsn32el: команда не найдена
qemu-mipsn32el: командата не е открита
qemu-mipsn32el: 命令找不到
qemu-mipsn32el: コマンドが見つかりません