dh_buildinfo: 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_buildinfo - from package: dh-buildinfo

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

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