gpodder-migrate2tres: 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/gpodder-migrate2tres - from package: gpodder

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

Error in other languages:
gpodder-migrate2tres: bevel nie gevind nie
gpodder-migrate2tres: comandă negăsită
gpodder-migrate2tres: comando não encontrado
gpodder-migrate2tres: commande introuvable
gpodder-migrate2tres: command not found
gpodder-migrate2tres: käsku ei ole
gpodder-migrate2tres: không tìm thấy lệnh
gpodder-migrate2tres: komanda nerasta
gpodder-migrate2tres: Kommando nicht gefunden.
gpodder-migrate2tres: kommandot finns inte
gpodder-migrate2tres: komut yok
gpodder-migrate2tres: nie znaleziono polecenia
gpodder-migrate2tres: níor aimsíodh an t-ordú
gpodder-migrate2tres: no se encontró la orden
gpodder-migrate2tres: no s'ha trobat l'ordre
gpodder-migrate2tres: opdracht niet gevonden
gpodder-migrate2tres: parancs nem található
gpodder-migrate2tres: perintah tidak ditemukan
gpodder-migrate2tres: príkaz nenájdený
gpodder-migrate2tres: příkaz nenalezen
gpodder-migrate2tres: команда не найдена
gpodder-migrate2tres: командата не е открита
gpodder-migrate2tres: 命令找不到
gpodder-migrate2tres: コマンドが見つかりません