how to clean my old bugs

Mon May 18 05:58:32 UTC 2020

Looking at my old reported bugs
https://bugs.launchpad.net/~corradoventu/+reportedbugs
I see many bugs that are no longer current and I would like to mark them as
closed or useless.
Some are about an Ubuntu version no longer maintained, some just
disappeared after updates.
How can I do? Change Confirmed to Invalid? or other?
Just add a comment explaining that?
thanks a lot

Corrado Venturini
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