So, if there were any error produced in updating one of the repositories, the results would be as described:
update-manager would correctly find and install updates, but not update the time stamp and so continuously report that updating is needed?
I no longer recall, but it could be that I had a repository at that time which produced a non-fatal error.
Around that time I had a local repository which I think produced the error that signatures or checksums could not be verified. I would expect myself to disable that repo & try the update again, but perhaps I did not. It would perfectly explain the symptoms and seems the most likely explanation to me.
So, if there were any error produced in updating one of the repositories, the results would be as described:
update-manager would correctly find and install updates, but not update the time stamp and so continuously report that updating is needed?
I no longer recall, but it could be that I had a repository at that time which produced a non-fatal error.
Around that time I had a local repository which I think produced the error that signatures or checksums could not be verified. I would expect myself to disable that repo & try the update again, but perhaps I did not. It would perfectly explain the symptoms and seems the most likely explanation to me.