git-import-dsc: 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/git-import-dsc - from package: git-buildpackage

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

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