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When I configuring grub, I found out that I have multiple linux image, like this
I checked with uname -r command, it showed 4.15.0-62-generic.
And then I checked on my /boot directory with ls -l, and the result is
The question is:
It's not unusual for kernel upgrade procedures to leave old kernels and attendant ramdisks and system maps in /boot after installing new ones. This allows grub to be used to select a different kernel if the kernel upgrade fails. if you looked at your grub config you'd probably see that the default is whatever kernel you're running , but there's other entries you don't see when you boot that are the older kernels.
Typically, you can mix and match kernels fairly successfully. So if your new kernel failed to work or some reason, you could boot off an old kernel and everything would probably work.
If you want to remove an image for some reason (botched install, won't boot, ...) just use your regular uninstall command, giving the full version. That tool does understand how to delete the kernel (and any ancilliary files, fixing configuration to match), it is used behind the scenes when installing a new kernel. There should be a knob to frob for the number of kernels to keep around, Fedora keeps three -- that works out fine.
