lp-review-notifier: 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/lp-review-notifier - from package: lptools

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