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Re: Sending mail from the terminal

You are spot on!   For the last ten days or so, My laptop was telling me that my system was up-to-date, but today I had a message telling me to download new files, which I couldn't.  So, yes:  the system is screwed. 
My only option, it seems is to do a full backup (which I do regularly anyway) and re-install Ubuntu - probably to V22. 

I am very careful not to visit dubious websites or download non-standard files so I would be interested to hear of any likely reason...
You are spot on!   For the last ten days or so, My laptop was telling me that my system was up-to-date, but today I had a message telling me to download new files, which I couldn't.  So, yes:  the system is screwed. 
My only option, it seems is to do a full backup (which I do regularly anyway) and re-install Ubuntu - probably to V22. 

I am very careful not to visit dubious websites or download non-standard files so I would be interested to hear of any likely reason...