matchbox-desktop: 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
/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/matchbox-desktop - from package: matchbox-desktop

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