I have installed debian jessie from unetbootin pendrive and without network drivers. After booting from HDD, I have added mounted pendrive to apt sources (with file:// prefix). I have two problems.

  • gnome-shell and other packages are not available from official mirrors (but are found on pendrive)
  • apt warns that packages in pendrive are not secure

I expected to expected to find GPG keys somewhere on pendrive and that they somehow passed verification during installation. How does this process work, so that I can fix it?

  • 1
    You need to add a gpg key that your apt repos on the pen drive can use to authenticate to your machine. This isn't automatic; you need to do it. – Faheem Mitha May 2 '15 at 18:15

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