chicken-uninstall: 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/chicken-uninstall - from package: chicken

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

On Debian possible default full paths are:

/usr/bin/chicken-uninstall - from package: chicken-bin

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

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