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catchercradle
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England
Joined: Jan 16, 2009
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Virtual Box under Linux kernel>6.12.x

I have noticed that since a recent kernel update I have had problems with Virtual box throwing up an error message.
VBoxManage: error: VirtualBox can't enable the AMD-V extension. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_SVM_IN_USE)
VBoxManage

To get VB to start I had to run in a terminal I run,
sudo rmmod kvm_amd kvm
My internet searches found the same error with, "intel" replacing "amd." for motherboards with Intel CPUs.

While the page I found the answer on had instructions to make the change permanent they did not work for me hence I am not posting them here.

The issue affects trying to launch VB myself as well as those launched by BOINC for projects such as LHC@home.
If anyone comes up with a sure fire way of making the change stick on reboot, it would be good to know that too!
[May 25, 2025 6:56:31 PM]   Link   Report threatening or abusive post: please login first  Go to top 
catchercradle
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England
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Re: Virtual Box under Linux kernel>6.12.x

Found another answer to making change permanent. add the following line in /etc/modprobe.d/blacklist.conf

blacklist kvm_amd
replace amd with intel if appropriate. I don't know what happens with ARM processors as it wasn't mentioned on the page I found this. I have yet to reboot since doing the latest change but users on another project say it works.
[May 27, 2025 8:23:35 AM]   Link   Report threatening or abusive post: please login first  Go to top 
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