pactester: command not found

Have You tried accessing the binary with the full path?

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/pactester - from package: libpacparser1

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