mips-linux-gnu-objcopy: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/mips-linux-gnu-objcopy - from package: binutils-mips-linux-gnu

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