I'm trying to install debian stretch on virtualbox before actually installing it on my machine. However, it fails on the step, "Installing the system" with following message:
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failed to determine the codename for the release
I tried this with both graphical and console based installers. However, when I do allow internet connection to the virtual machine, it does work and this error doesn't come. However, I want to ensure that debian installs without an internet connection, because when I'll actually install, that's how its going to be. The only internet source I have is through my wifi and that's not even configured at the bootup.