I'm not a Kubuntu expert or even user, so I will just list op the general steps.

[strit@lemmy.linuxuserspace.show]

I'm not a Kubuntu expert or even user, so I will just list op the general steps.

Boot into the live USB and unlock the encrypted drive. Make sure you have an internet connection too.
Then chroot (change root) into the OS drive you decrypted and look at the logs from last update or even boot logs if posisble to determine what went wrong during the update.
If possible fix the issue and complete a full update again (apt update & apt upgrade). Hopefully that should fix it.

Does your PC have any known hardware that requires proprietary drivers, like Nvidia or Broadcom?

[Guest]

Alright I got the USB up and running, decrypted the drive too, but no idea where to find the logs or how to decipher them (I'm guessing it's gonna be a giant mountain of technical jargon and system stuff, right?), or even how to fix everything. How do I do all of this exactly? How do I update it from the USB?

I also see timeshift as a folder, would it be quicker and easier to figure out how to restore from it again and fix things from within the OS or nah?

[prole@lemmy.blahaj.zone]

Unless they're referring to different logs, "journalctl" is the command you want to use. Maybe read the man page on it first though as you may want to use "-b" or "-x" or some other option to make it easier to parse.

[Guest]

Okay for some reason grub just came back to life outta nowhere?? Idk how or why, I was just fiddling around but what do I do now? Do I boot into a previous kernel or any of the ones tagged as "recovery mode"? Don't wanna screw this up lol.