ico: 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/ico - from package: x11-apps

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

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