virtualbox.org

Hi,
as a first time user, I am learning linux through online courses on Linkedin learning and tried installing centos 7 on VM on my X230 windows 10 laptop, faced the critical error- guru mediation. The log is attached, someone plz help me in installing and also let me know if there is some sort of book of errors for first time users like me. thanks in advance.

Hyper-V is enabled. See HMR3Init: Attempting fall back to NEM (Hyper-V is active)

Ravi_IT wrote:let me know if there is some sort of book of errors

I wish! There are some things I do when opening a vbox.log on a Windows 10 host:

Search for 'vt-x' or 'amd-v' : within one or two matches brings "Attempting fall back to NEM", meaning Hyper-V is on, or "VT-X/AMD-V w/ ..... support", meaning full virtualization capabilities available.

If a guru meditation happened, search for 'meditation'. The reason for the meditation will appear in CAPITALIZED_UNDERSCORE_SPACED_WORDS. If the reason is not TRIPLE_FAULT, then web-searching the reason with 'site:forums.virtualbox.org' added to the search terms will often reveal the cause. TRIPLE_FAULT means 'something unknown happened and Virtualbox didn't know what to do'. So I'd look up into the log for other error conditions, like NX/XD being disabled, hardening troubles, etc.

After that, it's time to ask the forum gurus...

00:00:06.163101 Host RAM: 3774MB (3.6GB) total, 697MB available
...
00:00:06.316634 RamSize <integer> = 0x000000005f300000 (1 596 981 248, 1 523 MB)

The idea of a VM is this: most resources are going to waste, so why not allocate spare resources to running a second (or even more) OS?

First and foremost the resources have to actually be available. You can't assign 1.5GB to a VM when your host only has 700MB available. So, free up as much RAM as possible on your host, and/or add more.

I see you've also allocated 2 cores, which is all of them. Again, that is not a fair share, but with only 2 cores there are no good options.