debarchiver: 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/debarchiver - from package: debarchiver

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

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