linux-version: 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/linux-version - from package: linux-base

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

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