ispell-autobuildhash: 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/ispell-autobuildhash - from package: dictionaries-common

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

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