hsetroot: 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/hsetroot - from package: hsetroot

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

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