Ive been here. U can use a bootable usb to boot. Then use switch root to change to ur actual filesystem (I'm glossing over a lot of complications here ask chatgpt) and update from here or just copy over the kernal.
this post was submitted on 04 Aug 2024
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When I used Arch I updated once and it removed the running kernel and its modules. So when I plugged in a webcam it didn't work, since the module was gone.
Not a catastrophe, but it was an off-putting user experience coming from Debian. Arch felt more like a desktop OS, Debian feels more like a server OS to me (updates generally warn/confirm when you need to restart services or the machine).
To each their own! Having more up to date stuff was a nice perk of running Arch, certainly.
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I have LTS and zen kernels installed in addition to the default Arch one, that should prevent this yes?
I'm not sure - I had zen and the default kernel and both were inaccessible
If you're planning for this type of failure, what you probably want instead is Aurora from the Universal Blue project. Since it's fedora silverblue underneath, your OS either updates all at once or doesn't.
This got me looking to see if there is any way to have a fallback as I have had something similar happen to me.
The general advice is to have a liveboot USB around. I even saw that you can have GRUB simply boot from an .iso file on the internal drives, which eliminates the need to keep a USB stick around.
I haven't followed the steps yet but I'll give this a shot because it intrigues me.
https://www.linuxbabe.com/desktop-linux/boot-from-iso-files-using-grub2-boot-loader
I always have a separate huge kernel on hand that boots without an initrd.
Or you could just install NixOS for update rollbacks (or use zfs/btrfs and set an alias to take snapshots whenever you update)