indi_v4l_legacy: command not found

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/indi_v4l_legacy - from package: indi-bin

You may install the required package with command apt-get install {package}

Error in other languages:
indi_v4l_legacy: bevel nie gevind nie
indi_v4l_legacy: comandă negăsită
indi_v4l_legacy: comando não encontrado
indi_v4l_legacy: commande introuvable
indi_v4l_legacy: command not found
indi_v4l_legacy: käsku ei ole
indi_v4l_legacy: không tìm thấy lệnh
indi_v4l_legacy: komanda nerasta
indi_v4l_legacy: Kommando nicht gefunden.
indi_v4l_legacy: kommandot finns inte
indi_v4l_legacy: komut yok
indi_v4l_legacy: nie znaleziono polecenia
indi_v4l_legacy: níor aimsíodh an t-ordú
indi_v4l_legacy: no se encontró la orden
indi_v4l_legacy: no s'ha trobat l'ordre
indi_v4l_legacy: opdracht niet gevonden
indi_v4l_legacy: parancs nem található
indi_v4l_legacy: perintah tidak ditemukan
indi_v4l_legacy: príkaz nenájdený
indi_v4l_legacy: příkaz nenalezen
indi_v4l_legacy: команда не найдена
indi_v4l_legacy: командата не е открита
indi_v4l_legacy: 命令找不到
indi_v4l_legacy: コマンドが見つかりません