mate-system-log: 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/mate-system-log - from package: mate-utils

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

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