Error during installation of 3CX Phone System ISO v18

[Aldo Lomabrdi]

When I'm trying to install the 3CX Phone System v18 on my VPS, I get this error when is setting up the package manager.

Says first "Scanning CD..." and the error appear, I don't know how to solve and I'm stuck.

 

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This generally happens when it cannot get out on the internet.

Make sure you set up the network details correctly.