how do I fix this error?

Question

dion@dion-Lenovo-ideapad-330S-15IKB:~$ apt install update
N: Ignoring file 'some-ppa.list.save.1' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'some-ppa.list.save.4' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'some-ppa.list.save.3' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
N: Ignoring file 'some-ppa.list.save.2' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
E: Type 'sudo' is not known on line 1 in source list /etc/apt/sources.list.d/docker.list
E: The list of sources could not be read.
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?

Answer 1

Read the last line of errors:

E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?

Are you root ? No, you are not, you have to run the command as:

sudo apt install update

to havw root / administrative rights.