zlocate: 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/zlocate - from package: zephyr-clients

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

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