arch update ignore kernel

The latitude is affected by this kernel bug:

https://bugs.archlinux.org/task/46894

I should make a UEFI entry for booting to the LTS kernel, but I haven't got around to this yet.

So in the meantime I think I'll do what's advised in this page:

https://www.digitalocean.com/community/tutorials/pacman-syu-kernel-update-solved-how-to-ignore-arch-kernel-upgrades

and add

IgnorePkg = Linux

to

/etc/pacman.conf

so the kernel isn't touched until the mainline resolves the bug.

[edit: did this and updated. The next time I booted I had the same problem as before. downgraded the kernel and it worked again. Need to look at moving to LTS kernel, I think]

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