dh_haskell_blurbs: 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/dh_haskell_blurbs - from package: haskell-devscripts

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

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