How do I update in ubuntu 20.4 with https// … release not found error

I am trying to update my packages in ubuntu 20.4 but its not working and gives the error below

Err:13 focal/mongodb-org/3.6.3 Release 404 Not Found [IP: 443]

I have removed or uninstall mongodb from my packages or machine but still sees this error anytime I run

sudo apt-get update
sudo apt autoremove

Can someone please help. Thank you all.

>Solution :

Uninstalling the package does not delete the repository. The non existing repo path is what causes the error with apt. You can take a look into your list of repositories and remove it from there.

$ apt-add-repository --list

There you should be able to see it.

And now delete it.

sudo add-apt-repository --remove <the-repository>

You can also remove the created sources file, which you’ll find in:


You might also want to remove remnants previously downloaded packages it in: (doesn’t solve your issue, but cleans up)


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