msd-datetime-mechanism: 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/msd-datetime-mechanism - from package: mate-settings-daemon-gstreamer
/usr/bin/msd-datetime-mechanism - from package: mate-settings-daemon-pulse

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