I've found a lot of conflicting and confusing reports about the #SecureBoot issue caused by a Microsoft update, so here's my relatively informed take about it.Spoilers: this isn't an issue with GRUB, but with another less known bootloader called shim. GRUB can also be affected though. So let's talk about how the bootchain of a #Linux distro works and what happened to it. 🧵 1/11