dh_icons: 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/dh_icons - from package: debhelper

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

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