uuserver: 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 CentOS possible default full paths are:

/usr/sbin/uuserver - from package: krb5-devel

You may install the required package with command yum install {package}

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