unibmp2hex: 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/unibmp2hex - from package: unifont-bin

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

Error in other languages:
unibmp2hex: bevel nie gevind nie
unibmp2hex: comandă negăsită
unibmp2hex: comando não encontrado
unibmp2hex: commande introuvable
unibmp2hex: command not found
unibmp2hex: käsku ei ole
unibmp2hex: không tìm thấy lệnh
unibmp2hex: komanda nerasta
unibmp2hex: Kommando nicht gefunden.
unibmp2hex: kommandot finns inte
unibmp2hex: komut yok
unibmp2hex: nie znaleziono polecenia
unibmp2hex: níor aimsíodh an t-ordú
unibmp2hex: no se encontró la orden
unibmp2hex: no s'ha trobat l'ordre
unibmp2hex: opdracht niet gevonden
unibmp2hex: parancs nem található
unibmp2hex: perintah tidak ditemukan
unibmp2hex: príkaz nenájdený
unibmp2hex: příkaz nenalezen
unibmp2hex: команда не найдена
unibmp2hex: командата не е открита
unibmp2hex: 命令找不到
unibmp2hex: コマンドが見つかりません