dh_ada_library: 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_ada_library - from package: dh-ada-library

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

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