pbuilder-dist: 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/pbuilder-dist - from package: ubuntu-dev-tools

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

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