Hi @ElleyLean!
Portions of your Ubuntu kernel, including linux headers, were automatically updated on your computer. When this happens, they don’t delete the replaced filesso you can rollback if you choose.
After an automatic update, the next time you manually install a package (with apt-get command) you’ll be informed of all the automatically replaced files so you can choose to remove them or not. You’ll also be informed of the files to be manually installed. It’s confusing at best, you’re not alone in being concerned.
Here’s the best over-arching explanation I’ve found so far: Why does apt-get think packages "are no longer required" - Unix & Linux Stack Exchange
So, go ahead and press Y if you dare! 