ulockmgr_server: 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:

/bin/ulockmgr_server - from package: fuse
/usr/bin/ulockmgr_server - from package: fuse

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

On Debian possible default full paths are:

/bin/ulockmgr_server - from package: fuse

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

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