Hi thank you for your reply. I have read somewhere else that that file could be edited but I didn't have the courage...
Now the updater is working, since I got to change the mirrow by runing as root in console "software-sources", then uninstalled the updater also from console ("sudo apt uninstall mintupdater"; "sudo apt purge mintupdater" , and install it again from there .
In my last post I forgot to say that when I was experiencing the first problems I had changed the mirrow into canada... I never know if my local mirrow should be trusted.
Anyway after refreshing the cache list I got this message now :
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Could not download all repository indexes
The repository may no longer be available or could not be contacted because of network problems. If available, an older version of the failed index will be used. Otherwise, the repository will be ignored. Check your network connection and ensure the repository address is correct in 'Repositories' under 'Settings'.
The repository 'cdrom://Linux Mint 18.3 _Sylvia_ - Release amd64 20171213 xenial Release' does not have a Release file.Data from such a repository can't be authenticated and is therefore potentially dangerous to use.See apt-secure(8) manpage for repository creation and user configuration details.Failed to fetch cdrom://Linux Mint 18.3 _Sylvia_ - Release amd64 20171213/dists/xenial/contrib/binary-amd64/Packages Please use apt-cdrom to allow APT to recognise this CD-ROM. 'apt-get update' cannot be used to add new CD-ROMsSome index files failed to download. They have been ignored, or old ones used instead.
I will unchecked this package from the sofware - sources - aditional repositories..