this post was submitted on 28 Feb 2025
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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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?
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.