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I want to install proxychains from terminal and the code is

apt-get install proxychains

but it said

Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?

How can I fix this?

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Execute the same command with sudo

sudo apt-get install proxychains

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Can you give a reason for why to use sudo? explain. – Alvar May 5 '13 at 11:04
Installation and uninstallation are Administrative tasks. You have to elevate your privileges to allow your user to install. Thats why you need sudo. – thefourtheye May 5 '13 at 11:07
Most of the time you are using Ubuntu you do not have the power to make significant changes to the system such as installing software. Take a look here for a more detailed explanation – Warren Hill May 5 '13 at 11:23
@Alvar: try ls -l /etc/var/dpkg/lock. You will see something like:-rw-r----- 1 root root 0 mei 5 10:43 /var/lib/dpkg/lock. So only root can do it. – user85164 May 5 '13 at 11:48
I know what sudo means I just wanted @thefourtheye to explain is answer more. Since the OP seemed to be new to Ubuntu... – Alvar May 5 '13 at 12:01

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