I have just installed the distribution Linux linux 18.3 and I have not installed or moved anything at all. I just try to run the
sudo apt-get update command to update the system packages and when running the command it generates the following problem:
W: The repository 'cdrom: // Linux Mint 18.3 Sylvia - Release amd64 20171124 xenial Release' does not have a Release file.N: Data from such a repository can not be authenticated and is therefore not Wow! repository creation and user configuration details.E: Failed to fetch cdrom: // Linux Mint 18.3 Sylvia - Release amd64 20171124 / dists / xenial / contrib / binary-i386 / Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update can not used to add new CD-ROMs: Some index files failed to download. They have been ignored, or old ones used instead.