bug#23910: [Guix Info][7.1.5] Should warn user about losing Internet or DNS connection

[Eus]

Hi!

When downloading substitutes via wireless connection, several times I 
encountered a case where the host name of hydra cannot be resolved. So, the 
"guix system init" fails and suggests the use of "--fallback" option. However, 
rather than continuing with "guix system --fallback init", one should actually 
try "dhclient -v WIRELESS_INTERFACE_NAME" first and then do "guix system init" 
again instead of "guix system --fallback init". My installation process is now 
going well with this strategy. Previously, I kept using "--fallback" that 
didn't solve the problem due to network connectivity error because using 
"--fallback" brought up built errors.

--
Best regards,
Eus (FSF member #4445)

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