check_urdf: 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/bin/check_urdf - from package: liburdfdom-tools

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

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