deb-reversion: 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/deb-reversion - from package: devscripts

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

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