debtags: 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/debtags - from package: debtags

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

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