process_wait: 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/lib/plainbox-providers-1/checkbox/bin/process_wait - from package: plainbox-provider-checkbox

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

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