How to solve this N: See apt-secure(8) manpage for repository creation and user configuration details.? [duplicate]

I use Ubuntu 20.04 dual boot.

sudo apt-get update

I get this:

Get:7 focal-security InRelease [107 kB]
Ign:8 focal InRelease
Hit:9 focal InRelease
Hit:10
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.
E: The repository ' 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.
How can I solve this?

0

1 Answer

Remove the cdrom entry from /etc/apt/sources.list file.

Regarding the PPA, it doesn't have files for Ubuntu 20.04. Remove it too.

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