indi_synscan: 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_synscan - from package: indi-bin

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

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