xcolors: 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/xcolors - from package: xcolors

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

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