E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)

Question

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?

Answer 1

sudo apt-get update && sudo apt-get upgrade

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