bossa: 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/bossa - from package: bossa

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