If you’re going to install Linux, Dell and IBM are generally very compatible. I’ve got a Dell 1500 series that runs Linux beautifully except the battery has given up the ghost and I need to replace it, also going to swap out the hard drive for an ssd. But Mate runs well on it, even the touch screen features work.
Linux will run fine with secure boot you just have to have it set for other OS not Windows specifically, however, it is a pain in the ass and if you have physical control over your machine I see no good reason to enable it, it significantly compliciates things like building your own kernels.