z80-unknown-coff-objdump: 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/z80-unknown-coff-objdump - from package: binutils-z80

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

Error in other languages:
z80-unknown-coff-objdump: bevel nie gevind nie
z80-unknown-coff-objdump: comandă negăsită
z80-unknown-coff-objdump: comando não encontrado
z80-unknown-coff-objdump: commande introuvable
z80-unknown-coff-objdump: command not found
z80-unknown-coff-objdump: käsku ei ole
z80-unknown-coff-objdump: không tìm thấy lệnh
z80-unknown-coff-objdump: komanda nerasta
z80-unknown-coff-objdump: Kommando nicht gefunden.
z80-unknown-coff-objdump: kommandot finns inte
z80-unknown-coff-objdump: komut yok
z80-unknown-coff-objdump: nie znaleziono polecenia
z80-unknown-coff-objdump: níor aimsíodh an t-ordú
z80-unknown-coff-objdump: no se encontró la orden
z80-unknown-coff-objdump: no s'ha trobat l'ordre
z80-unknown-coff-objdump: opdracht niet gevonden
z80-unknown-coff-objdump: parancs nem található
z80-unknown-coff-objdump: perintah tidak ditemukan
z80-unknown-coff-objdump: príkaz nenájdený
z80-unknown-coff-objdump: příkaz nenalezen
z80-unknown-coff-objdump: команда не найдена
z80-unknown-coff-objdump: командата не е открита
z80-unknown-coff-objdump: 命令找不到
z80-unknown-coff-objdump: コマンドが見つかりません