fd-commit: 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-commit - from package: fdroidserver

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

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