color_depth_info: 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/plainbox-providers-1/checkbox/bin/color_depth_info - from package: plainbox-provider-checkbox

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

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