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Problem using "apt-get update"




I had just done a minimal (command line only) install of Stretch from the first DVD of the complete set rather than using netinst to conserve bandwidth. The install as usual was successful.

I wish to install a package from the repository - it's not on DVD1.
I added the line
      deb http://ftp.us.debian.org/debian/ stretch main non-free contrib
to sources.list while commenting out the line referencing CDROM.

I attempted to run "apt-get update".
It *FAILED*
The message was the source I wanted was being ignored.

WHY?