uxterm: 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/uxterm - from package: xterm

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

On Debian possible default full paths are:

/usr/bin/uxterm - from package: xterm

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

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