ido2db: 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/debug/usr/sbin/ido2db - from package: icinga-dbg
/usr/sbin/ido2db - from package: icinga-idoutils

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

Error in other languages:
ido2db: bevel nie gevind nie
ido2db: comandă negăsită
ido2db: comando não encontrado
ido2db: commande introuvable
ido2db: command not found
ido2db: käsku ei ole
ido2db: không tìm thấy lệnh
ido2db: komanda nerasta
ido2db: Kommando nicht gefunden.
ido2db: kommandot finns inte
ido2db: komut yok
ido2db: nie znaleziono polecenia
ido2db: níor aimsíodh an t-ordú
ido2db: no se encontró la orden
ido2db: no s'ha trobat l'ordre
ido2db: opdracht niet gevonden
ido2db: parancs nem található
ido2db: perintah tidak ditemukan
ido2db: príkaz nenájdený
ido2db: příkaz nenalezen
ido2db: команда не найдена
ido2db: командата не е открита
ido2db: 命令找不到
ido2db: コマンドが見つかりません