dscverify: 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/dscverify - from package: devscripts

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

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