reconstruct: 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/lib/cyrus/bin/reconstruct - from package: cyrus-common

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

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