debsigs: 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/debsigs - from package: debsigs

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

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