dh_phppear: 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_phppear - from package: pkg-php-tools

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

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