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Ubuntu Linux Renew DHCP

How do I renew a dhcp assigned IP address under Ubuntu Linux desktop or Laptop systems?
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How do I configure an NTP (Network Time Protocol) client or server under CentOS / RHEL / Fedora Linux to manage the system clock over a network?
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Q. How do I configure IPv6 Tunnel under Ubuntu Linux? I'd like to browse and use IPv6 utilities under Ubuntu but my ISP is not ready with IPv6 native transport. How do I browser IPv6 ready websites using IPv4?
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Q. I'm getting following error on my Debian Linux system:

mv cannot move /etc/resolv.conf.dhclient-new to /etc/resolv.conf: Operation not permitted

How do I fix this problem?
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