fd: 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/fd - from package: fdclone

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

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