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Every time i try to $sudo apt update this error comes

in flag

Every time i try to sudo apt update this error comes

sudo apt update 
[sudo] password for tejas: 
Ign:1 cdrom://Ubuntu 20.04.2.0 LTS _Focal Fossa_ - Release amd64 (20210209.1) focal InRelease
Err:2 cdrom://Ubuntu 20.04.2.0 LTS _Focal Fossa_ - Release amd64 (20210209.1) focal Release
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit:3 http://dl.google.com/linux/chrome/deb stable InRelease                   
Hit:4 http://in.archive.ubuntu.com/ubuntu focal InRelease                      
Hit:5 http://in.archive.ubuntu.com/ubuntu focal-updates InRelease              
Hit:6 http://archive.canonical.com/ubuntu focal InRelease                      
Hit:7 http://in.archive.ubuntu.com/ubuntu focal-backports InRelease            
Hit:8 http://in.archive.ubuntu.com/ubuntu focal-security InRelease             
Ign:9 https://deb.nodesource.com/node_8.x focal InRelease                      
Err:10 https://deb.nodesource.com/node_8.x focal Release
  404  Not Found [IP: 2402:3a80:c000:23::2a6a:a208 443]
Reading package lists... Done
E: The repository 'cdrom://Ubuntu 20.04.2.0 LTS _Focal Fossa_ - Release amd64 (20210209.1) 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 'https://deb.nodesource.com/node_8.x 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.
guiverc avatar
cn flag
A quick look and I can see the last update on that repo was in 2019; ie. supported ended prior to 20.04 (2020-April) release came out. 3rd party sources are the end-users responsibility to perform security etc checks on before adding; did you?
mangohost

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