qmi-network: 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/qmi-network - from package: libqmi-utils

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

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