What do you mean with “birds part”? Learned from YouTube Videos, Arch Wiki, and experimenting on bare metal and in Virtualbox. Hardest part for me when installing Arch 1st time was partitioning and bootloaders

Do you have GRUB installed into the ESPs fallback path? (esp/EFI/BOOT/BOOTX64.EFI) I haven’t tried grub-install --removable yet, but maybe stuff got confused.

Had the problem only on one machine. Do you have, by chance, a MSI motherboard? Can’t myself think of other causes and having the kernel and initrd on btrfs instead of ext4 can’t be the problem?

Try pacman -Syu or just yay, if it doesn’t work after that get new mirrors from here: https://archlinux.org/mirrorlist/, and paste them into /var/pacman.d/mirrorlist. Comment out/in mirrors as needed. If you did the latter, do a full system upgrade (yay) again just in case

Yeah flatpak packages bring their own runtime packages so they’re more independent of the underlying system. I installed the steam flatpak now and it works just fine

When I upgraded lib32-nvidia-utils was already at 535, and the problem itself is still there for me. The probable cause is libcef invalid opcodes (dmesg)

traps: steamwebhelper[1959] trap invalid opcode ip:7f6575bdb794 sp:7fffa9a5d930 error:0 in libcef.so[7f65732ef000+7770000]