this post was submitted on 31 Aug 2023
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Linux
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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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Sounds like the NVRAM on your motherboard is full. Try deleting old boot entries from the boot list (using efibootmgr or a GUI for that), or maybe even reset the motherboard to factory defaults.
You should be able to boot your OS if you disable secure boot. After that you can try to fix the problem and turn secure boot back on, or leave it off if you don't care for it.