tlsdated: 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/sbin/tlsdated - from package: tlsdate

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

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