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I am trying to run this command:

sudo apt-get update && apt-get upgrade

but I keep getting these errors

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

I read in another answer that by using sudo these errors will be solved. But in my case I'm already using sudo. How to solve these errors?

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    You need to use sudo on the apt-get upgrade as well; the command after the '&&' is a separate command so isn't covered by the sudo on your first command. – guiverc Feb 6 '20 at 7:45
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sudo apt-get update && sudo apt-get upgrade

the commands before and after && are separate commands, so sudo must be used by both commands.

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