Error: Unable to update package cache. Please try "apt-get update"

Please follow the below template, it will help us to help you!

Expected Behaviour:

Should continue instalation

Actual Behaviour:

look at image attached

Debug Token:

?

sudo apt-get update

And then fix the errors and warnings that are displayed from the output of that command.

and how do i do that?im new to this type of stuff

Did you type the command I showed?

yes,it said

Reading package lists... Done
E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied)
E: Unable to lock directory /var/lib/apt/lists/
W: Problem unlinking the file /var/cache/apt/pkgcache.bin - RemoveCaches (13: Permission denied)
W: Problem unlinking the file /var/cache/apt/srcpkgcache.bin - RemoveCaches (13: Permission denied)

That's the command I need you to run.

im sorry for taking up your time

This is an OS level issue. Fix this problem, and then the Pi-hole installer will continue normally. If apt update does not complete, the Pi-hole installer will stop.

This is probably a really quick fix. I just need you to type sudo apt-get update and then let us know what the result of that is.

i got it fixed,thanks
but antoher question:
If i dont use a rasberry pi but instead my ubuntu desktop,do i just the the desktop IP
Im also going to be using the computer itself?is that possiblw

Yes. The Pi-hole instance will be running at this IP.

a bit of a problem;
it still keeps saying
Error: Unable to update package cache. Please try "apt-get update

Then you didn't get it fixed. What is the exact output from sudo apt-get update?

Ign:1 cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) focal InRelease
Err:2 cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) focal Release
  Please use apt-cdrom to allow APT to recognise this CD-ROM. 'apt-get update' cannot be used to add new CD-ROMs
Hit:3 http://gb.archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://gb.archive.ubuntu.com/ubuntu focal-updates InRelease              
Hit:5 http://gb.archive.ubuntu.com/ubuntu focal-backports InRelease            
Hit:6 https://dl.winehq.org/wine-builds/ubuntu focal InRelease                 
Hit:7 http://security.ubuntu.com/ubuntu focal-security InRelease               
Reading package lists... Done
E: The repository 'cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

It looks like you didn't remove the cdrom line after installing using the iso image.

You'll need to edit /etc/apt/sources.list and remove or comment out the cdrom line.

Normally that happens during Ubuntu's setup but for some reason it did not complete for you.

ubutnu wont let me as 'i have no permissions 'even after i rooted

What command did you type to edit the file?

i managed to solve that problem but
1.When i go into any website after putting in the IP in the DNS
2.I dont know if it works
3.The admin dashboard doesnt work
I did the installation

What IP? Where did you put it?

To be honest, I'm not sure either.

What URL are you trying to use?

Can you run pihole -d and provide the token URL that is printed after you accept uploading the logs to our secure server?

The IP i put in was my computers IP