install script: don't abort when "nix-channel --update" fails #2679
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Instead, print a message about what happened and tell the user what can
be done (run "[sudo -i] nix-channel --update nixpkgs" again at a later
time). This change allows installing Nix when you're offline.
Since the multi-user installer is so verbose, I don't print the message
until the end.
Fixes issue #2650 ("installation without internet connection").