Because I wanted to get more free space on my /boot, I deleted old kernels I accidentally deleted the active kernel, but the old ones are still present.
Can I simply reboot and start using the previous kernel ?
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initramfs, which will contain the needed tools for the kernel you're booting, so maybe it helps with udev and other dependencies. But nowadays, especially withinitramfses and distro-built kernels instead of your own, stripped down kernel, there are some out-of-the-kernel dependencies. My advice would be to just reinstall the kernel package while you're still with a running system. It's less trouble than if you have to chroot or the like due to boot failures. – njsg Jan 26 at 13:44