preunzip: 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 CentOS possible default full paths are:

/usr/bin/preunzip - from package: aspell

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/preunzip - from package: aspell

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

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