dnssec-trigger-panel: 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/dnssec-trigger-panel - from package: dnssec-trigger

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

On Debian possible default full paths are:

/usr/bin/dnssec-trigger-panel - from package: dnssec-trigger

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

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