brighton: 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/brighton - from package: bristol

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