this post was submitted on 29 Nov 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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As long as the laptop boots, you should be able to switch to a TTY console, where you have a complete shell interface to your system after logging in (in said TTY console). So, being greeted with a login screen or something is a win here - but you're very vague in your report.
The GUI is only just a program and has nothing to do with your boot options in BIOS or bootloader (like grub).
Using CTRL-ALT-[F1-9/0] you can switch between your virtual consoles and on only one of them your GUI is running.
You can use any other one to change anything on the system from CLI.
You should also be able to stop the current GUI/X11 Session and directly start the window manager you wish - temporarily to fix your system, if you're not confident in the CLI.