uservd: 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/uservd - from package: userv

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