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[[!meta copyright="Copyright © 2026 Free Software Foundation, Inc."]]
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[[!tag faq/running]]
[[!meta title="failed to initialize kvm"]]
Please always read README files.
Always.
Do you want to fix this warning, otherwise qemu will be very slow.
Install kvm:
$ sudo apt install qemu-kvm
Make sure that you can access /dev/kvm . You can easily check with
$ file -s /dev/kvm
that you properly get "ERROR: cannot read `/dev/kvm' (Invalid argument)",
which means that "file" was properly able to open kvm, just not smart enough
to use it :)
If you get "cannot open `/dev/kvm' (No such file or directory)", check in your
BIOS setup to make sure that accelerated virtualization is activated, and make
sure that the `kvm_intel` or `kvm_amd` module is loaded.
If you get "no read permission", make sure you give your user permissions to use
kvm:
$ sudo adduser $USER kvm
and log-out and log-in again.
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