utmpset: 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/sbin/utmpset - from package: runit

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