openmsx-debugger: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/openmsx-debugger - from package: openmsx-debugger

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