z80-unknown-coff-c++filt: 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-c++filt - from package: binutils-z80

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

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