approx-import: 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/sbin/approx-import - from package: approx

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

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