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E: The repository 'cdrom://elementary OS 5.1 hera - stable amd64 (20200204) bionic Release' does not have a Release file.

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In order to prevent this error you have to comment the line in your sources.list which asks for a CD Rom. An option to achieve this is by using command line.

1. Create a backup of the file first

Open your terminal application and paste or type the line

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

The system will ask for your administrator password, you have to type it. If there is no error message, continue with the next step:

2. Comment out the line which asks for CD rom

Type or paste into termimnal:

sudoedit /etc/apt/sources.list

and you will be into text edit mode of the system file I mentioned above. Using arrow keys of your keyboard you have to navigate to the line which starts with deb cdrom:[elementary OS .. and put the # sign in front of it in order to became #deb cdrom:[elementary OS.. or # deb cdrom:[elementary OS... Press ctl+o to save and then ctl+x to quit the application.

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