prefinish: 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/staden/bin/prefinish - from package: staden

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

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