How to fix this error when running sudo apt-get update?

Question

I'm getting the error below when I run:

sudo apt-get update

Any idea how this can be fixed?

check the highlighted error

You have configured some repositories to look for eoan and some other for focal. If you are running Focal Fossa (20.04), you can delete all the entries in files referring to eoan in /etc/apt/ — dariofac, Dec 22 '20 at 14:45
you have some references to Eoan Ermine (19.10) which is EOL since July this year: https://wiki.ubuntu.com/Releases — dragosht, Dec 22 '20 at 14:46
See the answer to this question: E: The repository 'http//archive.canonical.com precise Release' is not signed — user68186, Dec 22 '20 at 15:06

score 0 · Accepted Answer · answered Dec 22 '20 at 15:02

Open a terminal and open apt source list:

sudo nano /etc/apt/sources.list

(You can use other editor, but you have to open with sudo)

Search for

deb http://bg.archive.ubuntu.com/ubuntu eoan-updates Release

And remove that line. It's from an older version of ubuntu which is not supported in 20.04 (focal).

Then you must save and do

sudo apt update

and shouldn't be any more error.

1 Answers1