解决Ubuntu的Unable to resolve host name localhost问题

解决Ubuntu的Unable to resolve host name localhost问题：

How to fix it:

Make sure your /etc/hosts file has an appropriate entry for localhost (something like below)

127.0.0.1 localhost loopback

Make sure your /etc/nsswitch.conf file specifies a fallback to /etc/hosts, for example

hosts: dns [NOTFOUND=continue] files

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