kxterm: 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/bin/kxterm - from package: cernlib-packlib

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

On Debian possible default full paths are:

/usr/bin/kxterm - from package: kxterm

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

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