You should have the ability to boot back into the previously installed kernel version from Grub. Is that an option?
See if this is available: https://askubuntu.com/questions/1512466/is-that-possible-to-repair-a-broken-24-04-installation
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Have you tried making sure network manager is enabled and started?
sudo systemctl enable NetworkManagersudo systemctl start NetworkManagerFrom a live USB do you have networking?
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Does ethernet work?
Did you chroot and reupdate? You might want to reuse timeshift to roll back before doing so.
Could also try going back a couple timeshifts ago.
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Yes try to do that first. First research how to restore from timeshift backup so you do it properly.
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Chroot and fix broken packages, you can try apt or aptitude. Chroot: boot from live and mount the hard disk
