xxgdb: 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/xxgdb - from package: xxgdb

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

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