debsigs-signchanges: 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-signchanges - from package: debsigs

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

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