roxterm-config: 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/roxterm-config - from package: roxterm

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

On Debian possible default full paths are:

/usr/bin/roxterm-config - from package: roxterm-gtk2
/usr/bin/roxterm-config - from package: roxterm-gtk3

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

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