plotchangelog: 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/plotchangelog - from package: devscripts

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

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