ingo-admin-upgrade: 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/ingo-admin-upgrade - from package: php-horde-ingo

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

On Debian possible default full paths are:

/usr/bin/ingo-admin-upgrade - from package: php-horde-ingo

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

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