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I want to run this command (see section 4 from here https://help.ubuntu.com/community/AptGet/Howto#Removal_commands):

dpkg -l | grep '^rc' | awk '{print $2}' | xargs dpkg --purge

I use sudo at the beginning but anyway I get an error:

user@user-desktop:~$ sudo dpkg -l | grep '^rc' | awk '{print $2}' | xargs dpkg --purge
[sudo] password for user:
dpkg: error: requested operation requires superuser privilege

Why sudo doesn't work? What else should I type?

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2 Answers 2

sudo -i dpkg -l | grep '^rc' | awk '{print $2}' | xargs dpkg --purge

This may run your command with ROOT priviliges. Sudo and root is different. Reference

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try to login as root, to gain the super-power, you can do this by typing:

sudo -i

then write (copy/paste :: Ctrl + C / Ctrl + Shift + V <-- paste in terminal) your command in terminal, and it should work

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