xapian-chert-update: 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/xapian-chert-update - from package: xapian-core

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

On Debian possible default full paths are:

/usr/bin/xapian-chert-update - from package: xapian-tools

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

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