sudo command

How do I add a user to group under Ubuntu Linux operating system using command line options?

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How do I install TrueType fonts under Debian GNU/Linux desktop operating systems?

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I‘m typing the following command:

But, getting the error:

How do I fix this problem under Debian / Ubuntu / RHEL / CentOS Linux?

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How do I stop a process under Ubuntu Linux using command line and GUI tools?

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How do I install latest Firefox version 4.0 in Linux operating systems?

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How do list contents of directories in a structure like format under Linux operating systems?

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When I try to restart my BIND 9 server under Ubuntu Linux using service bind9 restart or service bind9 start command, I get the following error:
resolvconf: Error: /etc/resolv.conf must be a symlink

How do I fix this problem?

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