flatlo: 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/flatlo - from package: alliance

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