mkzeoinst: 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/bin/mkzeoinst - from package: python-zodb

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

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